LinearSolverFactory: Add a way to add new solvers at run time
Created by: mhoemmen
@trilinos/belos Story: #748 (closed)
For a given package's LinearSolverFactory, and for a particular template parameter combination, add a way to add new solvers at run time.
For example, if we implement Pipelined CG just for Tpetra objects, we want a way to add this solver to the list of solvers that Belos' factory knows how to create.