First steps towards making delay_message_clear useful. The intent is to use a

scrolling message window and show –more– only when the message window is filled with new messages since the last mesclr (as suggested by Eidolos/doy on ##crawl).

This currently works only on curses (breaks the DOS and Windows compiles), I'm working on fixing that. There are also some cursor glitches with prompts at the bottom of the message window that I need to fix.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@837 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 12, 2007
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