Moved unused documentational lua code to a separate file.

Added some words to "how to help" in the README.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7667 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dploog  on November 28, 2008
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