Merge pull request #42 from ThomasC44/master

Merge bugs fixed
Merge pull request #43 from ThomasC44/master

Debug coherence problem with leftTopCorner
Bugfix superposition with horizontal sorts
cleaned useless namespace
Merge pull request #44 from clefeuvre/master

Corrected problem with superposition and horizontal sorts
Code refactoring on GProcess, GSort and GAction