Added functionality that reports end-of-support information

- Products can reach their EOL (EOS) and then they don't provide any new updates
- FATE#316172
Added test case for products EOL (EOS)
New changes file entry and new version
Enhanced spec file

- Added URL to the GitHub project
Using Ladislav's more explicit way of comparing EOL

- to_i intentionally left there as Yast processes data from outside
Fixed dialog label

- And made it a bit ugly ;)
Merge pull request #7 from kobliha/product_EOL

Reporting products that have reached their end of support