More fixes upstream (tweaks to patches previously applied here)
Better sanity checking for broken CSS
Inform the user if broken CSS data exists in the message
Convert non-period decimal points to periods
The phpdoc states this method can take IMP_Maillog:: constants. Make it so.
Catch HTTP exceptions when trying to download external HTML resources.
Better notification message if a task has been completed but is still incomplete due to recurrence.
[jan] Fix displaying of due dates of recurring events in basic list view.
Merge remote-tracking branch 'origin/master' into caldav