Remove mpi USE flag from sci-chemistry/nwchem-6.5_p26243-r3 since MPI is mandatory for the 6.5 version; use tc-getPKG_CONFIG from toolchain-funcs.eclass instead of plain pkg-config; correct dep for pkgconfig to virtual; correct the pkgconfig names of libraries for the int64 versions

Package-Manager: portage-2.2.14
sci-chemistry/freeon-9999: Adding prefix.

The live version can now be installed side-by-side with the release version.