Added "error" channel for runtime errors, and changed error messages that

used the "danger" or "warning" channels to use that. Sending an error message to the error channel has the side effect of interrupting all activity.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5276 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on May 26, 2008
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