* Fixed issue with subtract operation triggering unusal behavior.
* Unified handling of the add,sub,mul,div operations.
* Updated and verified existing unit tests and added new ones covering
unhandled cases.
* Added basic requirements/readme.
Adding indexing to crashdumps to to ensure resistance to the device date
retraction.
When max crashdump count reach the file with higher index number will be
remove.
Added dumps rotation. Maximum count of the files set to 5.
The oldest dumps are removed if there're more than 5 of them.
Comparison is taken by the date.
Unified log and crash dumps rotators.
