and remove the useless node_modules directory

+  oracle enhancements in test/coloring

that is now genarated all the times by rdbg

- the mean degree was wrong
- the er generation was wrong

Of course this is only useful for algo that compute some kind of trees (more
specifically, this only work if the state contains a variable named "par" !)

Moreover, it was not taking into account whether the graph was directed or not.

The  rationale is  that the  Algo.spid that  gave processes  access to
their pid via their neighbors was a bit weird. Also, it makes the anonymity
of the algorithm more explicit: an access to the pid could appear anywhere
in the program, while now, the pid must be in state.t!

Now, if the  user needs the pid,  he must store it  explicitly in the
state via the initialization function.