Always register known namespaces. Warn if etree version is unsupported.
Always register known namespaces. Warn if etree version is unsupported.

bird-house/OWSLib,dblodgett-usgs/OWSLib,b-cube/OWSLib,JuergenWeichand/OWSLib,tomkralidis/OWSLib,ocefpaf/OWSLib,geographika/OWSLib,jaygoldfinch/OWSLib,gfusca/OWSLib,mbertrand/OWSLib,kalxas/OWSLib,kwilcox/OWSLib,jaygoldfinch/OWSLib,robmcmullen/OWSLib,QuLogic/OWSLib,jachym/OWSLib,Jenselme/OWSLib,menegon/OWSLib,KeyproOy/OWSLib,geopython/OWSLib