Merge pull request #19 from ThomasC44/master

Draw entire GActions, move every elements with the sort moving and draw arrow heads
Superposition Sorts
Fixing decimal separator bug : now GraphViz is forced to use US English numeric standards.
Merge pull request #20 from AurelienHP/master

Fixing decimal separator bug : now GraphViz is forced to use US English ...
Superposition resolu
superposition sorts resolu
Merge branch 'master' of https://github.com/pgroubioinfo/pgrou
Merge pull request #22 from EmnaBenAbdallah/master

Superposition of sorts handled
Debug the way actions are drawn