Shorten Lair to 8 levels.

In monster generation I collapsed monsters of Lair:1-2 to Lair:1 and Lair:3-4 to Lair:2, with the rest following as usual. Monster weights have not been changed.

The subbranch entrances are now as follows: Swamp/Shoals: 2-5 Snake : 3-6 Slime Pits : 5-8

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10666 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 13, 2009
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