switch back to /geoserver/gwc/service/wms

/geoserver/wms was causing opaque grey tiles outside bounds of layer
content but this doesn't happen with /geoserver/gwc/service/wms!
remove (Class) from DLCD layer - until we have others
show new layers in getfeatureinfo control
add title formatting, legend header to popup
only allow one popup per layer/feature info type