Teko: make Epetra dependency optional
Created by: ibaned
It should be possible to install Teko without having to build Epetra, if one is using only Tpetra-stack solvers.
We have reports that Teko depends on
ThyraEpetraAdapters, which requires building Epetra.
Motivation and Context
Applications that use only Tpetra-stack tools would prefer not to spend time compiling the Epetra stack.