update susetags parser for Code11

update susetags parser for Code11
- backwards compatible with Code10
- support updated 'content' format
  (see http://en.opensuse.org/Standards/YaST2_Repository_Metadata/content)
- augment specific package (REFERENCES line in content) with
   - product:name, product:version, product:distribution, product:flavor
   - add 'provides: product()'
   - add 'provides: product(<name>) = <version>'