will wait until after I come back to integrate his changes

Removing concept of ElementData: not general enough -- Adding GroupOfJacobian: sexier -- Revert to by group assembly -- *BUT* weak() takes elementID: up to now use one sort at the beginning -- Need to fix that

fix crash (when deleting widget with focus and pending callback; make sure the tree gets the focus before we delete all the children)

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Fixed special case of proportional metrics in metric intersection (but special case not coherent with general definition of intersection)

natural convection added in the incompressible code

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