hdf5_ep

[svn-r19250] New feature(bug #1934): I made H5Tset_order support all data types with some restictions:
        1. For enum type, members shouldn't be defined yet.
        2. H5T_ORDER_NONE only works for reference and fixed-length
           string.
        3. For opaque type, the order will be ignored.
        4. For compound type, all restrictions above apply to the
           members.

I'll change H5Tget_order and do another commit.

Tested on jam, heiwa, and amani.