fix HDFFV-8761:
allocating space for zero-length chunked dataset and asserting.
Snapshot version 1.9 release 187
- remove configure checks for MPI_File_get_size and Big
MPI_File_set_size as they are supported by most MPI implementations.
- fix bug in t_mpi.c (HDFFV-8856)
add a check to make sure MPI_File_get_size() returns correct value (HDFFV-8856).
bug fixes where a wrong type was used instead of hid_t.
add serial and parallel regression tests for zero dset read/write bug.
Snapshot version 1.9 release 188
merge from trunk.