- Update to version 6.1.0
* add a dvdnav_open2 API to setup a logging mechanism, similar
to libdvdread
* add a dvdnav_get_number_of_angles API
* add a dvdnav_version API
* rework the logs in the library and remove direct printf calls
* handle out-of-order ADMAP entries blocking playback
* fix crashes in dvdnav_describe_title_chapters in broken DVDs
* cleanup old code and buildsystem
- Added libdvdnav.keyring as source and enabled signature file
- Dropped libdvdnav-dvdread.patch (no longer necessary)
- Spec cleanup