Merge pull request #14 from ThomasC44/master

Remove dependancies for GVGraph, GVSubGraph and GCluster
display new actions position when the user is moving a sort
Merge pull request #15 from florem92/create-actions

Create actions
Merge pull request #16 from pgroubioinfo/create-actions

Actions moving with GSorts
Updated doc, changed width calcul in PH to get less "vertical" graphs
Updated doc (forgot to put them in the previous commit)
Merge pull request #17 from clefeuvre/master

Updated doc, changed width calcul in PH to get less "vertical" graphs
Draw second part of actions