Correct doxygen paths for Documentation/ dir.
Doxygen: Correct input paths.
Add/correct missing \f$ in doxygen comments.
Update doxygen config for 1.8.8.
Merge pull request #518 from endJunction/CorrectionsToDoxygen

Corrections to doxygen
[AL] Add LinearSolverType to GlobalSetup.

Used in NumericsConfig for coordination with global
matrix/vector types.
Merge pull request #519 from endJunction/RefactorDofTableConstruction

Refactor dof table construction
Merge pull request #520 from endJunction/AddLinearSolverInGlobalSetup

[AL] Add LinearSolverType to GlobalSetup.
[AL] Add back addToGlobal() in VectorMatrixAsm.
[T] Add GlobalMatrix/Vector to SteadyDiffusion2D example.
[PL] GW: Add LocalAssemblerData skeleton.
[PL] GW: Fill init, assemble. Add shape matrices.
[AL] Add LocalDataInitializer.

This adds a mapping from element types to the
corresponding shape functions. The latter are
passed as a template parameter to the
LocalAssemblerData.