Major changes:
- Added "Warning handling" page,
- Modified list of collections: added "Questionable files" and "Overridden by user files"

collections, removed "System errors" collection,
- Implemented support of browser by default,
- Added "collapse of synchronizer banner area" option,
- Realized support of system variables for defining of sync root folder,
- Added links between item coliections,
- Fixed number of previous version's errors,
- Updated language files.