Validate float map sizes so large maps aren't set ORIENT: float.

Changed the Rubicon to ORIENT: south.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1824 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on July 9, 2007
2D7VJ2GGCZDWAZ3GFXHCTZ7OCUJS3BJU7HAJMUMPYPBPZW5JVJUQC
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