Complete (first) implementation for darshan
-darshan-core: - initializes darshan job data structures - creates log file - writes job info header - reduces which modules were used locally/globally - shut down and write out individual modules one by one -darshan-posix: - register w/ darshan-core and allocate allowed memory - track open counter and timestamp for opened files - provide file record buffer at shutdown Major TODOs: - shared file reductions (prefer reusable across modules) - register handles with darshan file_ids (prefer reusable) - generic compression of module buffers (zlib/bzip2) - write out map of filenames to darshan ids - modify darshan-util and add darshan-posix parser to read logs