hdf5_ep

[svn-r9531] Purpose:  Bug fix(#213)

Description:  H5Pset_fapl_family sets family member size only for creating
new file.  The file doesn't keep this size information.  When the file is
re-opened, the size of first member file is used as the member size.

Solution:  Assume user knows the original member size and sets it through
H5Pset_fapl_family.  That will be the member size.  User can pass in value 0
as member size if he doesn't know the original member size.  Library will
choose the size of current first member size as the member file size.

Platforms tested: h5committest and fuss.