#15 created simple ToStringComparator
 #15 fixed a wrong binding in ResourceEditor
 #15 made it possible to set the metaclass in QueryJList and QueryComboBox
 #15 created TagAndTagGroupEditor
 #15 moved Taggroups to different package
 #15 created TaggroupUtils + jalopy
 #15 created ActionTagUtils
 #15 TagAndTagGroupEditor: added check if action tag is present