JPSSnagg

Removed incorrect call to free a local buffer in nagg_get_granules.c that caused make check failures due to memory corruption with xlc, pgcc and icc on Macs. Also addressed a few compiler warnings.

Two configuations still have tests that fail: xlc compiler on ostrich and clang on osx1010test, both linking to hdf5 trunk.  The output files seem to be correct, but the creation field in some of the output file names are not replaced with YYYYMMDDSSssssss, resulting in differences from the expected output.