bringing all changes from sandbox/euzuro/LayersReworking down into the trunk. this is a merge of r656:HEAD http://svn.openlayers.org/sandbox/euzuro/LayersReworking
git-svn-id: http://svn.openlayers.org/trunk/openlayers@806 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
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