Use HTTPS link for the AVC survey
Remove some unused code (is_heavy & some imports)
Fix invalid if condition in blocking notification
Add show_blockings option to the calendar widget

a24e7e5 introduced code using it but never added the option itself
Remove unused packages from requirements.txt
Use more recent zdaemon version
Remove an old modpython file from htdocs

why was this file still there anyway?!
Passthrough kwargs in WPNotDecorated, too
Reverted bug introduced when underscorifying
Fixed availability filter in map of rooms

* Fixed the RoomBookingAvailabilitySearchRooms service
* Fixed default datetimes in the filter
* Extracted Room.is_available filter into a method
* Replaced legacy datepicker with jQuery one
* Usability improved for dates selection
* Template cleaned up a bit
* Removed unused mixin and helper
jQuery datepicker icon disabled on disabled input