fixed usage of AQL user-defined functions from web UI

Conflicts:
	js/apps/system/aardvark/frontend/js/modules/org/arangodb/aql/functions.js
	js/apps/system/aardvark/frontend/js/modules/org/arangodb/arangosh.js
	js/client/modules/org/arangodb/arangosh.js
	js/common/modules/org/arangodb/aql/functions.js
	js/server/modules/org/arangodb/aql.js