Bug 362053

Many users don't need Akonadi running all the time; we aren't constantly receiveng or sending emails nor using any KDEPIM thing, but those 300 - 400 MB of RAM Akonadi uses would be very useful for the apps we work with most of the time; when I'm working I'm using 2 or 3 apps, don't want any other "parasiting" resources nor annoying me with inopportune notifications; I think most peoplpe who use their computers to work have similar habits. So, it would be nice to add a few of things to Akonadi:
- A "switch" to turn it off just with a click, an "akonadictl stop/start", but graphical. It could live in the system tray, for example. Or stop Akonadi after x time since the last Akonadi dependent program has been closed. This should be configurable, of course. 
- A KCM module to let the users configure if they want Akonadi to be launced by default when logiin in their sessions or want it to only wake up when they click said switch. The previously suggested autostart configurator should be in this same KCM module, I think, BTW.

Reproducible: Always