added mesh class
added an additional form of initializing a tesselation and extended points
validated the triangulation with a mesh
merged with devel branch
merged with mesh tests
Merge remote-tracking branch 'origin/devel' into devel
LM: tesselation update
Merge remote-tracking branch 'origin/devel' into devel
Merge remote-tracking branch 'origin/devel' into devel
modified slightly the boxsplines file