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set Geometry.AutoCoherence=2 to active this

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Technically, the divide and conquer algo has been 
replaced by a bowyer-watson with robust predicates.

Implementation of the client-based flag -changed- for python clients (native and interfaced). Plus some cleanup.

Store one "changed" flag per client; this allows to correctly detect which client needs to be run when a parameter is changed.

Warning: this changes the onelab protocol: now at version 1.1 -- you'll need to upgrade all your clients.

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fine-tune setChanged (the real fix will be to store the _changed attribute for each client in the parameter's _clients map)

- if no client is given, set the changed flag for all the parameters;
- if a client name is given and "changed" is false, affect only the
 parameters that are owned exclusively by the client;
- if "changed" is true, affect all parameters that depend on this client

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

improved def of 0Metamodel/Loop; moved def of 0Metamodel/Batch to a better place; def OL.isChanged(client); improved OL.show(param); plus clean up

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 

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