hdf5_ep

[svn-r15826] Description:
	Bring revision 15825 from trunk:

	Fix various problems with a the core & sec2 VFDs.

	Improve the h5_get_file_size() routine to handle files created with
VFDs that use multiple files.

Tested on:
	FreeBSD/32 6.3 (duty)
	Already tested on other machine, in trunk.