hdf5_ep

[svn-r10147] Purpose:
    Bug fix

Description:
    Filter callback routines were being called with memory "version" of disk
datatype (don't ask... :-), which could result in incorrect calculations in
the filter callbacks.

Solution:
    Rearrange code to call the filter callbacks after the final disk "version"
of the disk datatype has been created.

Platforms tested:
    FreeBSD 4.11 (sleipnir)
    Too minor to require h5committest