Fix 2121686: buggy net handling when returning to a level

FR 2029644: Some small tutorial improvements. Switch off autopickup if you see a monster turn invisible. (BR 2085502)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6970 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 21, 2008
B62LRY6EDGLIYGZCQC6UG76KGGCHQZUP6ZDFBPSWYF352ULQJQOQC
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