GitLab

- Use all_props lemmas

- Reorder the lemmas
- Use to_props_map properties

This implements
- Composable propositions in flock with `flock_res`
- Ability to add resources to AWP "on the fly"

- amonadG Σ
- + clean up a bit

without any optimisation.

Next steps:
 modify definition of wp_expr, with a deep embedding of
  - functions : to allow optimisation go recursively through lambdas,
    in particular, to allow exhale-inhale optimisation;
  - conjunction and equations : to allow optimisation
    of redundant and trivial equations