Patches for git plugin related reviews

[Sergey Vidyuk]

Hello

Patches for reviews
https://git.reviewboard.kde.org/r/102850/
https://git.reviewboard.kde.org/r/102857/
https://git.reviewboard.kde.org/r/102858/
are attached. Patch for 102857 is modified following the last suggestion from 
Milian. I've also uploaded modified version into reviewboard. I'm unsure if 
it's good idea to have cpp file for implementation of one empty function. 
Actually I'm unsure if it's good idea to have non-pure virtual function in an 
interface. If needed I can move implementation back to header or into plugins.

Sergey
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