[Ml-yokadi] ical support !!

[Sébastien Renard]

Happy new year fellow yokadi hackers and users !

Yes, that's it. We now have a (basic) support of ical in yokadi. What that ? 
Standard internet calendar format.
Some usage : 
- display your yokadi tasks in your favorite calendar tool 
(KOrganizer/Kontact, of course !)
- sync task with ical provider (google tasks for instance). You need an ical 
sync tool for that (like GCALDaemon).

That's included in the yokadi daemon when using "-i" switch.

That's very basic for the moment. Only read-only access and keyword management 
is buggy.

That's in "ical" branch of repo.

Enjoy.
-- 
Sébastien