[jan] Fix exporting events of a certain time span (piper@hrz.uni-marburg.de, Bug #12074).
Use Horde_String::truncate().
Include parent tasks in labels and only return completed tasks up to a week old as cost objects.
[jan] Allow self-signed certificates when using the fopen driver.
Bug #12065: Even if mailbox is invisible, muight still need to show if it has children
Merge branch 'master' into imp_6_1