Physics Module Dependencies

[JaredCrean2]

Currently the physics modules depend on:

using PDESolver  # setup LOAD_PATH to find all PDESolver components
using SolverCommon
using ODLCommonTools  # abstract type definitions + common functions
using SummationByParts
using PdePumiInterface  # common mesh interface implementation - pumi
using NonlinearSolvers
using LinearSolvers
using Utils
import ODLCommonTools.sview
using MPI
using Input  # input file processing
using PETSc2

I don't think they should depend on NonlinearSolvers, LinearSolvers, Input or PETSc2.