Updated the licence info and header for each file.Moved backends in separate folders
added some infrastructure to ease optimization (reusing vars)
added construction of a fanin table for local variables of a node. could be useful for a finer variable elimination scheme at the Lustre level. to be continued...
bug correction in homomorphic extension
Additional checks in transpose
Solved some bugs in the lustre printerGeneration of a witness with both the main node and hte inlined main nodeTest script modified to check consistency of the inlining process
Merge (if it works) of the lustre interfaces branche providing lusi files into trunk
Moved files to trunk in lustre_compiler