Remove debugging lines, reduce cost of envelope filter

... when the filter envelope fully convers the geometry envelope

git-svn-id: http://svn.osgeo.org/geos/trunk@4022 5242fede-7e19-0410-aef8-94bd7d2200fb
Fix bug in RectangleIntersection (was cought by testsuite too!)

git-svn-id: http://svn.osgeo.org/geos/trunk@4023 5242fede-7e19-0410-aef8-94bd7d2200fb
Fix bug in RectangleIntersection on finding rect fully contained

git-svn-id: http://svn.osgeo.org/geos/trunk@4024 5242fede-7e19-0410-aef8-94bd7d2200fb
Fix another boundary bug in RectangleIntersection

git-svn-id: http://svn.osgeo.org/geos/trunk@4025 5242fede-7e19-0410-aef8-94bd7d2200fb