Medium: PE: Enact a saner default for rsc_order.score (s/0/INFINITY)
Default to INFINITY which makes the ordering required rather than only advisory
Given: <rsc_order from=A to=B>

• Start A before starting B and stop B before stopping A
• If A (re)starts while B is running, stop and restart B
• If A cannot be started, do not start B (and stop B if its currently running)

Set score=0 for the old (advisory-only) behavior

Mercurial revision: dafa1c9abc5b75dfa923b6d4fd4dc3046721f889