core improvements from NPP in GL mosaic imaging extension and discovered
while testing IMesh improvements
Former-commit-id: f739d79bfd547adc295c716a1804f55f09b1bde1
defining a mesh. This is better practice than using arbitrary
MathTransform objects as it is well defined and allows for serialization
of the mesh to occur.
Former-commit-id: 7e4abe637edacca71e1e1c98d99521cd33415fb0
