add DenseTools.h and .cpp
Used specific properties of dense matrices in applyKnownSolution().
add Tests/TestTools.h to store utility functions
Added test for applying boundary conditions to a very simple example.
Reformatted the code.
GaussAlgorithm class should satisfy this interface
use a tempalte function to check interface of linear solver stuff
add zero initialization of global matrix.
Merge pull request #145 from norihiro-w/add-dense-solver-tools

Add dense linear solver tools