Rework matrix-import-export tests.
Work on export algebra test.
Rewrites in testing method of file comparison & matrix import export.
Work on tests.
Updates in tests.
Fix in CMake.
Fixes in tests.
Work on test of matrix solvers.
Fix in a test.
Fix bfd linking.
Enhance the nonlinearity test by adding the AND / OR difference testing.
Add the possibility to turn off valgrind tests.
Fix default values in CMake.
Work on CMake.
Fix a test.
Work on devel.