Revert "Use active scope for retrieving repositories." This reverts commit d053813dcf22b74cded34daf5734e54388e9bee6. Conflicts: app/controllers/home_controller.rb app/controllers/ontology_search_controller.rb app/helpers/application_helper.rb app/models/repository/destroying.rb

Use active scope for retrieving repositories. I could have introduced a default scope, but this would result in broken migrations: Some migrations change existing repositories. They would fail at selecting repositories because there is no column 'destroying'. Also default scopes cannot be overridden.

fix failing test of url maps controller

fix further poermission checks in the views (url maps)

authorize more ontology controllers

add url mappings for repositories implementation part for #181