Mistakely pushed a .bak.
Fix examples to please the arity check.
Add a benchmarking test.
New version of the syntax.

Make the newline a regular and ignore whitespace, in particular, allow to split a rule into multiple lines.
The whole thing is a lot simpler.
Numerous modifications related to rule/lsys separation.

- Engine : The compression and the application of rules can be done separatly and in a far more flexible way.
- Grammar : Ability to defined token with possibly optional arguments. Ability to define their graphical meanings.
- Grammar : Fully whitespace insensitive.
- Verification : More flexible verification for arity and definitions.

Globally, most stuff can now be done at the rule level, not the lsystem level. Will document soon™.