prudently put between #if 0 #endif Those should allow
to produce better quality quad meshes and more robust
triangular meshes (random factor has disappeared) : 
Technically, the divide and conquer algo has been 
replaced by a bowyer-watson with robust predicates.

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coherence now removes degenerate entities (curves, surfaces & volumes). Not toroughly tested !!!

Cleaned code and window for high-order tools. Revamped fast curving (more robust and uses BL data when available). 

communication to the metamoodel of the Gmsh batch and loop status; OL preprocessors returns the /changed/ status of the client; /changed/ flag of all parameters set to false after a /compute/; param attributes updated (not replaced) by a parameter redefinition; + some clean up 

Quick fix to mark as boundary layer nodes the nodes that result from the subdivision of boundary layer elements  

some optimisation.