Removed Epetra_Comm from Albany tpetra branch (both Albany and AlbanyT executables).

Aeras test cases fail now if ALBANY_EPETRA_EXE is off.  Need to figure out why.

There should now be no Epetra if ALBANY_EPETRA_EXE is off.  Need to test by
trying to build against Trilinos w/o Epetra to see if I missed any Epetra.