timing_150518: Disabled abort when calling GPTL routines before GPTLinitialize
               (so can use with Chombo library, for example); changed top 
               level default from nanotimer to MPI_WTIME. 
               [Patrick Worley]
timing_150327: Added option to more accurately measure measurement overhead
               (incurring additional overhead, so not on by default).
               [Patrick Worley]
timing_150217: Added support for enabling/disabling start/stop timers from 
               perf_mod even when calling GPTL routines directly from C/C++ 
               libraries; increased maximum timer name length.
               [Patrick Worley]
timing_141119: Enabled cmake build of timing library.
               [Jayesh Krishna]
timing_140805: Disabled GPTL autoinstrumentation, as this conflicts with the
               VampirTrace tool. (We do not use the autoinstrumentation 
	       capability.) [Patrick Worley, from B. Jamroz]
timing_140416: Changed Makefile so that .mods and the static library are copied to 
               LIBROOT
timing_140317: Modified Makefile to deal with shared mpi-serial builds
timing_131108: Added memory retrieval commands for BG/Q [S Mickelson]
timing_131023: Added explicit include path for gptl.h [J Edwards]
timing_130827: added routines supporting non-null terminated timer labels, for use with
               with C++ std:string (and more efficient usage with Fortran); also CMake 
               logic fixes
               [Patrick Worley]
timing_130506: Copy all modules to the include directory on install
timing_130417: Made nano time the default timer if available.
timing_130316: Changed declarations of functions used in qsort in gptl.c, to eliminate
	       error with Cray compiler (and warnings from other compilers)
               [Patrick Worley]
timing_130214: NAG port: Put mpif.h include before "save", and don't use
	       "abort" and "flush" extensions for NAG. [Sean Patrick Santos]
timing_120921: Add code for cmake build, should not have any affect otherwise
timing_120731: Correction in Makefile for serial build [Jim Edwards]
timing_120728: Replace process subset optional parameter in t_prf with 
	       outpe_thispe optional parameter. Change def_perf_outpe_num to 0. 
	       [Patrick Worley]
timing_120717: Retain timestamp on cp in Makefile   [Jim Edwards]
timing_120710: Correct issue in Makefile [Jim Edwards]
timing_120709: Change for BGP to measure on compute nodes rather than IO nodes only,
               minor Change in Makefile so that gptl can build seperate from csm_share
               in cesm [Jim Edwards]
timing_120512: Bug fix in global statistics logic for when a thread has no events 
	       to contribute to the merge (mods to gptl.c)
	       [Patrick Worley]
timing_120419: Minor changes for mpi-serial compile (jedwards)
timing_120408: Make HAVE_COMM_F2C default to true. (jedwards)
timing_120110: Update to GPTL 4.1 source (mods to gptl.c and GPTLprint_memusage)
               [Jim Rosinski (GPTL 4.1), Patrick Worley]
timing_120109: Bug fix (adding shr_kind_i8 to shr_kind_mod list)
timing_111205: Update to gptl 4.0 (introducing CESM customizations); 
               support for handles in t_startf/t_stopf;
               support for restricting output to explicitly named process subsets
               [Jim Rosinski (gptl 4.0), Patrick Worley]
timing_111101: Workaround for mpi_rsend issue on cray/gemini
timing_110928: Add a Makefile and build as a library usable by mct and pio
timing_101215: No changes from previous tag other than updating Changelog
timing_101210: Fix interface to cesm build system, add workaround for xlf bug
timing_101202: updated get_memusage and print_memusage from GPTL version 3.7; adds
	       improved support for MacOS and SLASHPROC
	       [Jim Rosinski, Chuck Bardeen (integrated by P. Worley)]
timing_091021: update to GPTL version 3.5; rewrite of GPTLpr_summary: much faster, merging 
	       events from all processes and all threads (not just process 0/thread 0);
	       miscellaneous fixes
	       [Jim Rosinski (gptl 3.5), Joseph Singh, Patrick Worley]
timing_090929: added explicit support for the GPTL-native token HAVE_MPI (indicating
	       presence of MPI library)
	       [Patrick Worley]
timing_081221: restore default assumption that gettimeofday available
timing_081028: bug fix in include order in gptl_papi.c
timing_081026: change in output format to make postprocessing simpler
timing_081024: support for up to one million processes and writing timing files to 
	       subdirectories
timing_081017: updated to gptl version 3_4_2. Changed some defaults.
               [Jim Rosinski, Patrick Worley]
timing_080629: added optional parameters perf_outpe_num and perf_outpe_stride to t_prf.
	       These are used to override the user specified values for timing data
	       written out before the end of a simulation.
               [Patrick Worley]
timing_071213: changed default to disable inline keyword; changed global statistics
	       logic to avoid problems at scale; moved shr and CAM routine equivalencies
	       to a new module (in perf_utils.F90); added t_getLogUnit/t_setLogUnit
	       routines to control Log output in same way as shr_file_get/setLogUnit;
               modified GPTLpr logic to support output of timing data during a run
               [Patrick Worley]
timing_071023: updated to gptl version 2.16, added support for output of global
               statistics; removed dependencies on shr and CAM routines; renamed
               gptlutil.c to GPTLutil.c
               [Patrick Worley, Jim Rosinski]
timing_071019: modified namelist logic to abort if try to set unknown namelist parameters; 
	       changed default number of reporting processes to 1; 
               reversed meaning and changed names of CPP tokens to NO_C99_INLINE and NO_VPRINTF
               [Patrick Worley]
timing_071010: modified gptl.c to remove the 'inline' specification unless the
	       CPP token C99 is defined.
               [Patrick Worley]
timing_070810: added ChangeLog
               updated to latest version of GPTL (from Jim Rosinski)
               modified perf_mod.F90:
               - added perf_outpe_num and perf_outpe_stride to perf_inparm 
	         namelist to control which processes output timing data
	       - added perf_papi_enable to perf_inparm namelist to enable
	         PAPI counters 
               - added papi_inparm namelist and papi_ctr1,2,3,4 namelist
	         parameters to specify PAPI counters
               [Patrick Worley, Jim Rosinski]
timing_070525: bug fix in gptl.c 
               - unitialized pointer, testing for null pter
                 before traversing
               [Patrick Worley]
timing_070328: modified perf_mod.F90
	       - deleted HIDE_MPI cpp token
	       [Erik Kluzek]
timing_070327: bug fixes in gptl.c 
	       - testing for null pters before traversing 
                 links; added missing type declaration to GPTLallocate for sum
	       bug fixes in perf_mod.F90 
	       - fixed OMP-related logic, modified settings reporting, 
	         modified to work when namelist input is
                 missing; moved timer depth logic back into gptl.c
	       [Patrick Worley]
timing_070308: added perf_mod.F90 
	       - defines all t_xxx entry points - calling gptlxxx directly 
	         and removing all external gptlxxx dependencies,
                 added detail option as an alternative way to disable
	         event timing, added runtime selection of timing_disable,
	         perf_timer, timer_depth_limit, timing_detail_limit,
	         timing_barrier, perf_single_file via namelist parameters
	       modified f_wrappers.c 
	       - replaced all t_xxx entry points with gptlxxx entry points, 
	         added new gptlxxx entry points, deleted _fcd support
	       modified gptl.c 
	       - deleted DISABLE_TIMERS cpp token, modified GPTLpr call
	         and logic to move some of support for concatenating timing
	         output into a single file to perf_mod.F90
	       modified gptl.h 
	       - exposed gptlxxx entry points and to add support for choice 
	         of GPTL timer
	       modified gptl.inc
	       - removed t_xxx entry points and expose gptlxxx entry points
	       [Patrick Worley]
timing_061207: modified gptl.c 
	       - improved event output ordering 
	       [Jim Edwards]
timing_061124: modified gptl.c 
	       - modified GPTLpr to add option to concatenate
	         all timing data in a single output file, added GPTL_enable
	         and GPTL_disable as runtime control of event timing, 
	         process 0-only reporting of timing options - unless DEBUG
	         cpp token defined
	       modified gptl.h 
	       - redefined GPTLpr parameters
	       modified f_wrappers.c 
	       - added t_enablef and t_disablef to call GPTL_enable and 
	         GPTL_disable, added t_pr_onef, added string.h include
	       bug fix in f_wrappers.c 
	       - changed character string size declaration from int to size_t
	       bug fix in gptl_papi.c 
	       - modified error message - from Jim Edwards
	       modified private.h
	       - increased maximum event name length
	       [Patrick Worley]
timing_061028: modified f_wrappers.c 
	       - deleted dependency on cfort.h
	       [Patrick Worley]
timing_060524: modified f_wrappers.c 
	       - added support for CRAY cpp token and fixed routine 
	         type declarations
	       [Patrick Worley]
timing_051212: original subversion version 
	       - see CAM ChangeLog for earlier history
