Several CSS revert and clean up
Added RNDT export service
Added some refinement in RNDT export
Updating left header and adding logos
Merge remote-tracking branch 'refs/remotes/origin/rndt' into rndt
Merge branch 'rndt' of github.com:geosolutions-it/core-geonetwork into rndt
Fixed gml namespace for rndt export