* aGrUM
* Adding `gum::{AllDiscreteVariable}.toFast()` to write the variable in *fast* syntax.
* Fixing a bug in BN's random generators : `domain_size` incremented by 1 (thanks to Kenneth Lee).
* Fixing a bug in *fast* syntax : `'A[n]' with n<2`.
* pyAgrum
* Adding `pyAgrum.{AllDiscreteVariable}.toFast()` to write the variable in *fast* syntax.
* Fixing a bug in BN's random generators (e.g. `pyAgrum.randomBN`) : `domain_size` incremented by 1 (thanks to Kenneth Lee).
* Fixing a bug in *fast* syntax : `'A[n]' with n<2`.
* Modifying (lightly) the structure for documentation.