correct error in keep-complete processing: 
Rectangle.intersects(Rectangle r) returns false if 
r has 0 width or height.
Effect: Closed ways crossing a tile were ignored when
their map units are rounded so that the polygon looks
like a straight vertical or horizontal line.


git-svn-id: http://svn.mkgmap.org.uk/splitter/trunk@381 838fabe5-b1a8-4b81-9896-7a84386980e9