- some plays trying to deal with ids in the store API

- some plays trying to deal with ids in the store API
- Clean MediaSetAccess, now it can be used!, well,
  getPossiblyCachedFile is not, but at least you can download stuff.
- a test file in my devel dir to test media set access
- Put the suse media verifier in its own file
- move ProvideFilePolicy to zypp/ so it can be used by MediaSetAccess
  later
- Make media set access use OnMediaLocation too.