ufz/ogs — pull request #236 by wenqing (2013-10-14 08:46:29+00:00)
Title: PETScLinearEquation is splitted into three classes

The overloaded interface is used to test the new classes. These classes can be also used for the generic interface, if its assembly of the submatrix to the global one becomes generic, and function applyKnownSolutions of PETScLinearSolver is just moved out its owner to become an independent function.