hdf5_ep

[svn-r8084] Purpose:
Improvement.

Description:
Verbosity level were specified by numbers which are not meaningful
and prone to typos.

Solution:
Adapted the Verbosity predefined level symbols from HDF4
and changed all numberic verbosity to symbolic values.
(Still need to convert some left over macros like MESSAGE.)

Platforms tested:
Eirene.
No h5committest since this is trivial.

Misc. update: