modutils
--------

- use string for version, and check only date?
- review logic: should this module be mandatory?
  if not, what should happen with mixed require(), require_module(),
declaration and no declaration?
- Update user documentation including template(s) for Lua modules once the
  preceding question is decided.

mcb
---

- test: make each handler run at least once
- doc: make an "example" section
- doc: add a word about compatibility
- code: verify that the return value of callback.register is checked