Major overhaul of tutorial messages and clean-up of tutorial.cc

I've also hopefully fixed a bug concerning entry vaults during the tutorial.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1038 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 14, 2007
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