added tool to display configured grids. Only works with a valid MapProxy configuration file
added tool to display configured grids. Only works with a valid MapProxy configuration file

--HG--
branch : util_grids

kaiCu/mapproxy,mapproxy/mapproxy,drnextgis/mapproxy,Anderson0026/mapproxy,vrsource/mapproxy,mapproxy/mapproxy,procrastinatio/mapproxy,geoadmin/mapproxy,camptocamp/mapproxy,kaiCu/mapproxy,faegi/mapproxy,geoadmin/mapproxy,faegi/mapproxy,camptocamp/mapproxy,Anderson0026/mapproxy,drnextgis/mapproxy,olt/mapproxy,vrsource/mapproxy,olt/mapproxy,procrastinatio/mapproxy