including the merge of `hdffv/hdf5/develop`, back to the branch that Vailin and
I share.
Now I need to put this branch on a fork with a less confusing name than
vchoi_fork!
(A) #5: Add the "pb_expansion_threshold" field to the "H5F_vfd_swmr_config_t" structure
and update H5Pset_vfd_swmr_config() and H5Pget_vfd_swmr_config() accordingly
(B) #13 bullet 2: Comment H5F_vfd_swmr_config_t in H5Fpublic.h properly
(copied from John's description in the RFC)
(C) Change the field name "vfd_swmr_writer" to "writer" in "struct H5F_vfd_swmr_config_t"
(as indicated on page 11 in the RFC) and all references to it
(2) Test files for encoding/decoding property lists
(3) Fix test failures for PB statistics in test/page_buffer.c
(Will double check with John later about PB statistics collection)
compatible between 32 and 64 bit systems.
Expand cross platform property list encode/decode testing.
Fix warning in H5P__fill_value_enc.
Tested: jam, koala, ostrich (h5committest), ummon