hdf5_der

[svn-r25769] Updated the test_usecases.sh script to use h5_fileaccess() so it checks
supported VFDs under 'make check-vfd'.

Note that some VFDs do not pass this test! SEC2 does, however, and this
was never really tested before so I'm checking in the code anyway. The
VFD-specific errors can be fixed later.

Tested on: jam with multiple VFDs