One name is enough for one thing

"You are in a maze of twisty passages, all alike"
Fix typo
Merge branch 'master' of https://github.com/GeoNode/geonode

Conflicts:
	geonode/layers/templates/layers/layer_detail.html
Change to PRINT_NG, check for PRINTNG

PRINTNG_ENABLED is obscure and looks like a typo.
Changing it to PRINTING_ENABLED doesn't work either, because it exists
in distinction to MAPFISH_PRINT_ENABLED, which is still in use.
So change to PRINT_NG_ENABLED.

If PRINTNG_ENABLED is encountered in config, use this, and log a
deprecation message.
Merge branch 'master' of https://github.com/GeoNode/geonode

Conflicts:
	geonode/layers/templates/layers/layer_detail.html
	geonode/maps/templates/maps/map_detail.html
Merge pull request #1494 from jean/master

One name is enough for one thing