The MAP_OR_FAIL macro is resolving fopen rather than fopen64,
causing a NULL function pointer to be executed in the wrapper
in the case of using Darshan's LD_PRELOAD mechanism.

darshan-logutils now returns an error when encountering a log file
with a module version number greater than what the library was
built with. all utilities were also updated to account for this
modification

bug reported by William Yoo

The stdio module stores names for the default streams (stdin,
stderr, stdout) in the following format: <STDERR>. The '<' and
'>' symbols require proper escape characters in order to be
properly interpretated by the darshan-job-summary (perl) script.

POSIX_F_OPEN_TIMESTAMP is now POSIX_F_OPEN_START_TIMESTAMP
POSIX_F_CLOSE_TIMESTAMP is now POSIX_F_CLOSE_END_TIMESTAMP

I also added POSIX_F_OPEN_END_TIMESTAMP and
POSIX_F_CLOSE_START_TIMESTAMP, so we can better understand how
long open and close phases are for some applications.