Clear iframe with empty(), not setting the src attribute. This prevents the 'load' trigger of all preview iframes to fire.
Merge branch 'master' of github.com:structr/structr
Removed log output
Added built-in functions has_[outgoing_|incoming_]relationship and get_[outgoing_|incoming_]relationships.
Fixed existing relationship methods to use relType correctly when given.
Merge branch 'master' into structrdb-master

Conflicts:
	structr-ui/src/main/resources/structr/js/pages.js