vchoi_fork

[svn-r5278] Purpose:
    Migrate from configure macros of XYZ_ABC to H5_XYZ_ABC
Description:
    configure generates many macros definitions on the fly and
    were stored in src/H5config.h which is included by H5public.h.
    But other software that uses hdf5 may also run their own configure.
    There can be a clash in macro name space.  We decided awhile ago
    to prepend all generated macros with "H5_" to avoid conflicts.
    The process has started and this commit completes it (at least attempt
    to).
Solution:
    Many macros symbols (e.g. SIZEOF_xxx and HAVE_xxx were changed to
    H5_SIZEOF_xxx and H5_HAVE_xxx).  Then H5private.h no longer includes
    H5config.h.  This cuts H5config.h away from HDF5 source code.
Pending issues:
    The module of fortran and pablo are to be resolved in a different
    commit.
Platforms tested:
    eirene (parallel), arabica (solaris 7 --enable-fortran, --enable-cxx)