Fixed a bug that made silence last forever. This also meant

moving "Your hearing returns." where it belongs, thus fixing 1773460.

I also moved a couple of messages (namely weapon noises, and hell effects) into MSGCH_TALK and MSGCH_SOUND, both of which now are ignored as travel stoppers. I didn't check all instances of potential talk and noises, but if there are cases where we want a message to always stop resting, we could move the message in question to MSGCH_WARN or MSGCH_MONSTER_SPELL. Conversely, there's probably lots of stuff around that could also get ignored.

Users can still specify messages in stop_travel that will interrupt both rest and travel. (There's currently no distinction, and I made no changes on that account.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2089 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 15, 2007
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