Add confirmation before stepping on known magical traps.

(part of FR 1793669). Added description for reaching ego (bug 1792851). Added sorting statement before showing item knowledge, so items of the same class now are sorted alphabetically.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2081 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 13, 2007
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