Make distortion weapons unmarked, restore old chances of generation (well,

spears and staves now have a slightly lower chance of distort, but I will live with that).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@727 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on December 29, 2006
KAGDUJFWWZGGIYQECFGRHNSQT47XIUN3ZTSETAIWLYIZ43QXGQ2AC
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