update: correct menu item category view id (issue #607)
simplify deleteObsoleteFiles() (#620 related)
fix detcat_num (issue #625)

On old categories view it must be set to 0, on categoriesdetailed view it is already set so 0 is overwritten by original value.
altered thumbnail scaling (issue #553)
- ensure full image is inside max. area
- don't scale up
- css correction
altered calendars (issues #622, #621, #551)
added new text COM_JEM_TITLE_SHORT, COM_JEM_VENUE_SHORT, COM_JEM_TIME_SHORT, COM_JEM_WHAT
frontend calendar views: changed "label" (issue #624)
...to "text-label", not found in any css
recurrence: check all events of series on auto-creation (issue #626)
show recurrence icon (frontend) (issue #627)
(new text: COM_JEM_RECURRING_EVENT, COM_JEM_RECURRING_EVENT_DESC, COM_JEM_EDITEVENT_WARN_RECURRENCE)
Fix undefined properties in some frontend views (issues #633, #634)
- slug in editevent and editvenue views
- multi...date in all calendar views
- all optional props in common list tmpl
Merge branch 'develop' into feature/recurrence

Conflicts:
	site/common/views/tmpl/default_events_table.php
	site/views/editevent/view.html.php
remove saved event from recurrence set or dissolve set (issue #627)

When an event is saved it is always removed from a recurrence set.
Also a complete recurrence set is dissolved if this is the first event.
show recurrence icon / warning (backend) (issue #627)
wrong upload path if no venue images (issue #635)
Can't choose venue after search - function lost (issue #637)
fix undefined property (issue #636)
New content plugin to dissolve recurrence
 if first event is deleted (issue #627),
add version check to package (issue #632)
Merge branch 'develop' into feature/recurrence
edit event: warning text improved (issue #627)
fix Joomla 3.x check for package (issue #632)
fix little typos
recurrence: diff. icon / text for first event (issue #627)