Reset Message_Line and New_Message_Count to 0 after loading message history

from the save file. This fixes a two-fold bug with the tutorial "welcome back" message, a lack of a –more– prompt and some line-wrapping glitches.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9826 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on May 25, 2009
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