ufz/ogs — pull request #148 by TomFischer (2013-06-14 09:35:22+00:00)
Title: Clean up solver structure and made class GaussAlgorithm a class template.

- Removed several useless classes (```LinearSolver```, ```DirectLinearSolver``` and ```DenseDirectLinearSolver```) and in the consequence the inheritance structure of solvers.
- Class ```GaussAlgorithm``` is now a template class. The template arguments are matrix type and vector type. For new matrix and/or vector types it is necessary to specialize the template. This is already done for vector type ```double* ```.