[conf/intel] force stable libpng
[conf/intel] force stable dev-libs/icu
[intel/portage] drop mdds mask
[intel/portage] enable szip and fortran for sci-libs/hdf, required by sci-visualization/kst
[intel/portage] disable USE=fortran for hdf, we want threads
[intel/portage] mask dev-python/pillow
[intel/portage] USE=-fortran for sci-libs/netcdf
[intel/portage] Remove mask on dev-games/cegui, not relevant anymore. Also see bug #2615