Merge PrimOp0/PrimOp1 to Op and merge PrimApp0/PrimApp1 to App.
Merge PrimOp2 into Op.
Merge PrimOp3 into Op.
Merge ForeignImport into Op.
Merge TupN into Op.
Collect the non-fallthroughs in a single place.
Unclassify compileOp.
Merge pull request #181 from pjonsson/format-fixes

Follow the PrimOp/PrimApp changes in feldspar-language.