[A] Add ProjecData::processes iterator interface.
[PL] Add Process interface for solve() and post().
[A] Initialize and solve processes from main.
[PL] GW: Add solve() and post() skeltons.
Merge pull request #516 from endJunction/CreateDofMap

Create dof map
Merge pull request #517 from endJunction/Skeletons

Adds solve, post function skeletons for processes and calling them from main.
[PL] Add initialize debug message.
[PL] Add simple GWFprocess::post() writing result.
[PL] Add next steps for solve().
[PL] Add GlobalSetup as template to GW process.
[PL] Add global matrix and rhs/solution vectors.
Add LinearSolver to GWProcess.
GW: Make linear solver happy with identity matrix.
[PL] GW: Add vector of local assemblers.