+ issue #0001474: crash selecting constraint
+ fix some issues
+ issue #0001475: Implement a 3 point arc similar to solidworks in sketcher
+ allow to use copy() method for a null shape
+ fixes #0001399: Only build Salome Mesh when necessary
+ ignore v/h axes and grid of sketcher on view fit
+ fixes #0001188: Change the word 'datum' as the label for the entry field for arcs and circles.
+ fixes #0000844: Cannot use edge hidden by sketch axis as external geometry
+ undo bad fix and add a comment
+ fixes #0001332: Allow copy-paste on elements in Project tree
Merge branch 'master' of ssh://git.code.sf.net/p/free-cad/code
+ issue #0001475: Implement a 3 point arc similar to solidworks in sketcher
+ issue #0001475: Implement a 3 point arc similar to solidworks in sketcher