Accelerate monster generation in the Vestibule after the player spends enough

time there. Needs more tuning.

[1773000] Fixed tracer crash, mea culpa.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1995 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on August 13, 2007
ID373JATLMWAY526Q6Q5FXHRNFWMEOFXPHGPAUUY5OAMPFDN5SJAC
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