Make formatted_string::parse_string() split up the string into chunks of

999 characters or less so that formatted_string::cprintf()'s character buffer doesn't overflow.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2199 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on September 25, 2007
P27CK6YAMMIV5XMISUZXYOJDOEFFVDW5AESKZCFHXGDFVRH6KRBQC
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