Style adjusted for compatibility with stackalytics.com

Change-Id: I97bc0effbaf8209a05cd3e64aa3b0c54fe5c105b
Commits correction framework is implemented

* Introduced new parameter in config file
* Added a notice for changed commits to UI
Also:
* Fixed default config param for sources_root
* Removed background image from layout

Implements blueprint commits-corrections-framework

Change-Id: I3c2c76a45ed75aaf67671b02649ba6abc24be083