Display notice on change log list, when change log feature is disabled

I propose we display notice (red, like "search filter in effect") above change log list, when change log is not enabled via configuration. We could also tell, that user must enable "la-la-la" variable in configuration to start change log tracking.

Message text could be:

1. Change log is currently disabled. Turn on "Track database changes to change log" setting to enabled it.

2. Also make "Track database changes to change log" text into a link. Once clicked it will ask use "Enable tracking database changes to change log?" with "OK"/"Cancel" buttons.

3. If "OK" is clicked, then we can create event, that would use kApplication::SetConfigValue method to change related config setting right away without a need for a user to search for location of particular config setting.