Merge pull request #5 from chambart/master

Fix des problèmes dans fixpoint
Bon, je vais voir où je peux caser ça.
Hgraph printer in a separate file
Test that fails oddly, seems that the analysis doesn't go through after a rec definition
Keeping modulename in cloning
verbosing dot generation
Adding useless variables
Printing trec
Bugfix: recursive definition bad hedge
Adding commented printing functions
Dump tlambda option
Adding printer options
Warning when output node is unreachable