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All interactions and activity tags are reviewed to fix bugs like duplicated
root applied rules, and also reduces the amount of duplicated/useless work, e.g:
- Simulation trees are not expanded anymore when simulated objects are modified.
- 'expand' activities are merged (i.e. dropped) with any other 'expand' activity
  for an ancestor.
New implementation exposes new API that hides much complexity to the developper
about activity dependencies.

By default, expand() now automatically defers any work if the current
transaction takes too long time. This method also gains a parameter to
explicitely choose when to expand, which is often important in unit tests or
solvers. In particular, when postponing work, it takes care of setting proper
activity dependencies.
- If you have any code requiring to expand everything immediately, you'll have
  to replace 'expand()' by 'expand(expand_policy="immediate")'.
- On the contrary, you should replace any '...