hdf5_ep

[svn-r14004] Description:
	Fix problem with datatype messages where the version of the format
for a datatype message could depend on the "use the latest format" flag from
the file after it was initially created.

Tested on:
	FreeBSD/32 6.2 (duty)
	FreeBSD/64 6.2 (liberty)
	Linux/32 2.6 (kagiso)
	Mac OS X/32 10.4.10 (amazon)