hdf5_ep

[svn-r10776] Purpose: Bug fix

Description: See details from Bug #213.  Family member file size wasn't saved
anywhere in file.  When family file is opened, the first member size determine
the member size.

Solution:  This is the first step of fixing this bug.  Member size and name
template(unused at this stage) are saved in file superblock.  When file is reopened,
the size passed in through H5Pset_fapl_family is checked against the size saved
in superblock.  A different size will trigger a failure with an error message
indicating the right size.  Wrong driver to open family file will cause a failure,
too.

The second step will change multi driver that wrong driver will cause a failure.

Platforms tested: fuss and h5committest