Change for compiling GEOSX with Trilinos/Tpetra interface

[klevzoff]

This PR works around the following problem:

ParallelTopologyChange.hpp includes SurfaceGenerator.hpp. When GEOSX is compiled with TrilinosTpetra as selected LAI, it therefore transitively includes TpetraVector and TpetraMatrix, which include forward declaration headers from Tpetra. However, because PTP does not have either linearAlgebra or physicsSolvers as its dependency, BLT/Cmake does not place Trilinos install dir on its include paths, and the compiler fails to find those Tpetra headers. I simply added linearAlgebra as a dependency for now (adding physicsSolvers would create a circular dependency).

Couple notes:

1. This was not an issue with Epetra-based interface (or Hypre/Petsc) because we did not include any Epetra headers in EpetraVector or EpetraMatrix, instead simply forward declaring the types ourselves. This is significantly more difficult to do with Tpetra, because the types are templates with a bunch of default parameters that are defined deep in Tpetra headers at config time. It would be unwise for us to try replicate all those namespaces/types. Luckily, Tpetra provides forward declaration headers for every public type (e.g. Tpetra_Vector_fwd.hpp), and we have to include those.
2. This workaround is not great, because obviously PTP does not have a dependency on linearAlgebra. Root of the issue is that it includes SurfaceGenerator.hpp only for the definition of ModifiedObjectLists. A better solution would be to put ModifiedObjectLists in its own header and forward declare it in both of the above. Or at least move definition to ParallelTopologyChange.hpp. Let me know your preferences.

Related to GEOS-DEV/GEOS#1086