hdf5_ep

[svn-r17176] In H5Odtype.c, the decoding function used to mark the datatype as on disk.  I changed it
to undefined and let the caller functions decide the location of the datatype.  For
H5Tdecode, it should mark the datatype as in memory.  For other callers like H5Dopen or
H5Aopen, they should makr it as on disk.

Tested it on jam, smirom, linew.