We only delete directly in GModel if nothing was changed in the internal CAD models

has not.

Added use of boundary layer mesh data structures for high-order fast curving (not robust). Added in SetOrderN cleaning up of pointers to destroyed elements in BL mesh data structures.

Please get in touch if you are (really) using this: we will discuss how to re-instore some of the
functionality using the new reparametrization code

occ rounded rectangle + prepare NEWREG() & co for occ + cleanup access to NEWREF() & co where it should not be used

"Ruled Surface" makes no sense: use "Surface" instead. A "Surface" will try to do the filling "the best it can".

are OK but still, not everything has been tested