So, have published my work on this in new branch leamas. It's a big rewrite, and hard to cherry-pick from.

To my very provisional understanding, it has the potential to close about 12 of the open issues:
- #2: Run tests from locally built rpms (option --prebuilt)
- #4: List all available tests (from trunk)
- #30:Unable to download spec file
- #32 Option to use spec bundled in srpm (--rpm-spec)
- #36 Partly solved, unpacked sources are in review directory on fixed location
- #37 Better names for report directories
- #45 Add selective test running (--exclude and --single-test)
- #46 Run diff -r when md5sum differs
- #47 Apply licensecheck on patched sources, after %prep
- #49 In correct md5sum (possibly OK also in trunk?)
- #50 rpmfusion bugzilla does not work (--url option)
- #51 Configuration file: removed. Should be re-added with better semantics and documentation
- #52 Running of editor: removed
- #54 Default mock-config: fixed, using /etc/mock/default.cfg for default.
- #55 TRaceback on 821732

Other fixes:
- Rmplint test should not require silent rpmlint
- Naming test should not state Naming Guidelines OK just by checking charset in name
- The workdir options are removed. f-r now creates a result directory in current dir
- Logging level when not using -v can be set using environment variable FR_LOGLEVEL.
- Tests are normalized and can be invoked using python -m unittest ... Some more tests added.
- Fixed bug caused by request library uncompressing data in some situations.
- New test: rpmlint on installed package
- Refactoring: code in fedora-review moved to review_helper module (testability). New modules Settings and Mock. init splitted into several new modules, basically one per class. Code to grab url:s from different sources modeled into a common class with descendants.
- Provides/Requires attachments are generated
- New test: package installs

This means that the bulk of ideas I have got by using f-r are implemented, I don't foresee big changes by me at this point.

Of course, testing by others is more than welcome, as is feedback (in this issue). However, I might still do push -f here, please don't trust the branch if you clone it.