Colomoto-jupyter

minibn`:
- add `BooleanNetwork.save` method

* fix `minibn.BooleanNetwork.__call__`

Changes:
- `minibn`: improve `constants()` and `simplify()` methods

Bugfixes:
- `modelchecking`: fix `ITS` formula syntax

- `minibn`: workaround evaluation of constants

- `minibn.BooleanNetwork`: support for comments in `.bnet` rules

* compatibility with Python 3.10

`colomoto.minibn.BooleanNetwork`:
* add `make_hash` method (https://github.com/colomoto/colomoto-jupyter/commit/c719f658e8792b0cb57c816f6797f6446a9d664f)
* `random_walk` stops at fixed points