Hacking manual: documented how to create tags

Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>
Make IDLE mode to work again

Refactoring in commit 6cbd2498 touched wrong class's "idle" call.

Found-by: Tomasz Żok <tomasz.zok@gmail.com>
Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>