Everytime a monster in your LOS doesn't wake up (= you pass the Stealth check), there's a 5% chance of exercising Stealth by 1. Yes, this is probably much too frequent (normal Stealth exercising happens with 1/18 chance once every 20 turns), but I'd prefer decreasing the probability of plain Stealth training in favour of the active training, anyway, though I've no idea what the actual numbers should be.

Add "passive trap-training" (FR 1865590): Everytime you detect a trap by setting it off, T&D gets exercised by 1 or 2 (50% chance each), same as for detecting a trap by searching.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3382 c06c8d41-db1a-0410-9941-cceddc491573