Dependency on Solid/PowerManagement from KDELibs4Support

[Christoph Feck]

Checking what blocks porting away -workspace and -desktop from 
KDELibs4Support, I see Solid/PowerManagement. I have not checked what 
exactly is needed from this module, but could we release this module 
separately if there is no plan to integrate it back to Solid?

--
Christoph Feck