* seacas: new release and fixes for metis/parmetis
* Update to add sha256 checksum for latest seacas release
* Updated the documentation strings with new applications
* Fixed the metis/parmetis variants and logic depending on whether mpi
is enabled/disabled. (There is still a zoltan issue I need to fix,
but this will at least allow seacas to be built without
metis/parmetis or with +mpi+parmetis. The ~mpi+metis still needs
work elsewhere.)
* Enable cpup, slice, zellij in +applications