_#76504 - Add delete columns.
First commit. UI changes in toolbar.
Merge branch '8.5-SNAPSHOT' of github.com:Emergya/sir-geoexplorer-base-js into 81364-Busquedas_predeterminadas

Conflicts:
	widgets/EditionToolbar.js
_Corección función isOwner()
Merge branch '8.5-SNAPSHOT' of github.com:Emergya/sir-geoexplorer-base-js into ContextJS
Se comentan recientes cambios a falta de prueba más profunda.
Merge branch 'ContextJS' of github.com:ajrodriguez/sir-geoexplorer-base-js into ajrodriguez-ContextJS

Conflicts:
	widgets/EditionToolbar.js