General code cleanups and goto removal.

Fixed a possible crash when using Backspace to restart character selection.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1855 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on July 13, 2007
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