OpenCards - A free flashcard learning extension for Impress-0.16.3

It is with great pleasure for me to release OpenCards 0.16.3 (aka OpenCards 1.0 RC 6). No new features were added, but some more bugs became fixed:
* fixed: Keyboard shortcuts are broken when recently found items are being processed
* fixed: Drag'n'Drop seems to be broken quite often
* removed: Untranslated dialog that appeared after the end of each last-minute learning session
* More verbose error messages in crash dialog