fix WFS 2.0.0 getfeature
fix WFS 2.0.0 getfeature

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