important resolvers for the file management view

Differentiate managed and user created event in the personal calendar,
reactivate the icons for this in themes after upgrade of fullcalendar
library, better placement of the help in the calendars configuration

status, all users, guests flags

OO-3489, OO-3492, OO-3493, OO-3494, OO-3496, OO-3497: infrastructure to export user data, export  portraits, notes, personal folder, calendars, subscriptions, delete calendars after usser deletion

OO-3332: the main calendar is always visible in its context (course calendar always visible in its course, same for group, user and home)

OO-1645: the internal links must close the callout window after being clicked, fix order for the CalendarKey

OO-1645: propagate the business rules for private event on home calendar and calendar tool of the course

OO-1645: output the aggregated calendar with the ICAL beautifier and with UTF-8 encoding, fix NPE in print view, remove save and copy

OO-1635,OO-722: refactor the ajax by iframe to use XHR, push the current business path to the browser via HTML5 push state, implements back button support via HTML5 History API...

OO-1645: add sort, add feed for imported calendar, fix visibility of imported calendars right after import, fix ids of imported calendars

OO-1645,OO-1595: refactor the personal configuration of calendars, the datamodel of imported calendars, make the description visible and editable...

OO-1647: remove auto-subscribe of course calendar, list of course which the user is member of and which have a calendar ( as configuration or as course element)

OO-1338: English translations, add access informations in auto-publish, publish informations in status panel...

OO-1254,OO-732: fix default template in certificate settings, wording, english translation, fix breadcrumb in the efficiency statement user tool