Feature added to detect if a event is already imported and skip this event.

test import with a file Here a test session:

$konsolekalendar --list-calendars

7 - (Read only) Open Invitations
8 - (Read only) Declined Invitations
9 - Persönlicher Kalender

$konsolekalendar --import /tmp/test.ics --calendar 9
Calendar /tmp/test.ics successfully imported

$ konsolekalendar --import /tmp/test.ics --calendar 9 --dry-run --verbose
Insert Event skipped, because uid "KOrganizer-1943585507.454" is already known. <Verbose>
Insert Event skipped, because uid "KOrganizer-949295754.111" is already known. <Verbose>
Insert Event skipped, because uid "KOrganizer-135574846.1006" is already known. <Verbose>
Calendar /tmp/test.ics successfully imported