public freebusy crashing - wip

This pull request contains part of patches done for public freebusy.
Although not yet fully implemented, I would like those patches to get in as there are
few that are very important imho like 54325f3, 3e0eb4d, 281bff9, f13c23d
copy&pasted from previous line :)
Now that you said that, it makes perfect sense. Thanks!