Fire TUT_SEEN_TRAP when a trap is detected, in addition to when a trap

is triggered. Give info on avoid mechanical and natural traps by leviating or flying, and that natural and magical traps can't be disarmed. Give hint resting on up-stairs to make quick escape from monsters, and note that monsters can't follow up up unless they're right next to you.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5322 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on May 28, 2008
HNX5L5QUZWBQTOBEVKJTAMRX5NOCK7CVBIKMCLYEJLVJNCCUCXUAC
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