Added posibility to draw all edges of the simplicial complex.
Added a simple test case to the DEMO application.
Deleted unused is mesh functions.
Added += key and -= key operators to the SimplexSet class + test.
Bugfix in get_qualitites function.
Updated the DSC test functions.
Rotate around the object in DEMO application.
Added test of flip 4-4 and flip 2-2 and minor clean up in tests.
Bugfix in line geometry shader.
Bugfix in topological boundary edge removal; now the 2-2 flip is only performed if at the boundary.
Switched to the new mesh operation functions (split, collapse and flips).