Flat & round stripe buttons (Internal Mode only)
v.2
[log] layout: align the changes browser toolbar with the log toolbar

* Remove ActiveSurface: this intermediate layout is not needed.
* Move all components from it to the MainFrame.
* Pull the changes browser splitter up in the component hierarchy -
  make it the main splitter, first component of which is toolbar,
  optional branches panel and the graph table with optional details,
  and the second component of which is the changes browser.
(IDEA-115964) Fix root scanner and errors notification for vcs without RootChecker
remove smelly isPhysical() check
in power save mode, display a hint in settings that autopopup completion and automake don't work (IDEA-115749, IDEA-102048)