Removed amnesia/forgetfullness trap, mutation and scroll. The

mutation has been replaced with an involuntary shouting mutation, and the trap with an alarm trap. The scroll hasn't been replaced with anything, and the frequency of scrolls of random uselessness has thus doubled; someone needs to re-do the scroll frequencies.

Also added a "drifting" mutation, which causes the player to sometimes drift in a random direction after moving.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2464 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on October 14, 2007
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