hdf5_ep

[svn-r19567] Maintenance: Added -O3 to be used with the C Intel v 11 compilers; set default to -O for all
             unknown versions of the C Intel compilers.
             Modified apple config file to display Intel compiler information.
             Updated RELEASE.txt notes accordingly.
Platfroms tested: jam, amani and dubna (Mac 64-bit) with Intel C, Fortran and C++ compilers.