Editor: Various dialogue button bar improvements
- factor out the button bar into a separate class (for re-use in script dialogue)
- improve handling of deleted records
- disable buttons that do nothing (e.g. because of a document lock)
- add an user setting to switch cycling mode for prev/next on and off
(RM-2729 from redmine: created on 2015-06-27 by Marc Zinnschlag, , closed on 2015-06-27 by Marc Zinnschlag)
Edited by redmine