Fire an AI_SEE_MONSTER activity interrupt if a non-safe monster un-submerges

while the player is running, and provide a message if it's a trapdoor spider doing it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8147 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 2, 2009
7I3W2GQ2USM3JHD7BG24FSIBZDAWUMI24BSEMDQ6PRR3D76SRDDAC
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