Moved the python environment into 'tools', added Project object in the python environment alongside minor changes, created some scripts to test the environment, and changed make_dot function in topology.ml such that it removes the path of a file before using it as graph name.

Added tools/test/skeleton to test gg and gg-deco. Made also small modifications to make_dot (in topology.ml)

Added an error message when neato doesn't work (when using "gg UDG -du|-dur ...") that is affected by --silent (aka. -s)

Debugged, renamed CommomGraph ClassicGraph, placed all the UDG utils from RandomGraph into a new module, enhanced "gg <command> -s" such that is has effect on warnings, removed "rand" function

Added comments, enhanced 'gg -h', changed some names, replaced an UDG tool function with another, and other minor things.

Added GraphGen to dune. The command is gg. Also added some comments to some .mli files, and reorganized a bit the functions.

Added the tool genGraph, to create .dot graph files (random ones or not, depending on the graph type).