dev-modular should be completely merged into mmap-dev branch

Conflicts:
	darshan-runtime/Makefile.in
	darshan-runtime/darshan-core.h
	darshan-runtime/lib/darshan-core.c
	darshan-util/Makefile.in
	darshan-util/darshan-bgq-logutils.c
	darshan-util/darshan-diff.c
	darshan-util/darshan-hdf5-logutils.c
	darshan-util/darshan-logutils.c
	darshan-util/darshan-mpiio-logutils.c
	darshan-util/darshan-null-logutils.c
	darshan-util/darshan-parser.c
	darshan-util/darshan-pnetcdf-logutils.c
	darshan-util/darshan-posix-logutils.c

- modules now receive a memory buffer after successfully
registering with darshan-core. modules can request a specific
memory amount, but may not be honored depending on the configured
darshan memory limit
- split the previous register_record function into 2 parts:
    * lookup() -> lookup darshan_record_id corresp. to path name
    * register() -> register record_id & name with darshan-core
- register_record now returns true if the record added; false
otherwise (if module was out of memory or darshan is out of memory
for storing id->name mappings)

- prevents inadverdent disabling of Darshan on some MPICH builds
- fixes #94

Currently, this tool can take a set of temporary, uncompressed log
files on a given node, and combine into a single darshan log.
Next step would be to modify this code to perform shared file
reduction logic to combine per-node log files into per-job log
files.

Now, register_record() accepts an argument for the size of
the record being registered, and this is used to track how much
data each module has stored in their allocated memory region.