* Add a getPoint function to simplify xPoint creation from mVertex (no
   need of vector like getPoints which is more general).

 * make alive commented (in xMesh) printMesh and printEntity functions.
   They will certainly move to AOMD interface one day. But for now
   please let them stay active has I use then for debugging in my
   application. No time to do a test case on the subject.

 * To avoid warning on unused variable clean creation of object returned
   by many function that are not used afterward.