[*] .ruari-quinn_rc support

[*] Add configure time tests for __attribute__ support.

[*] Does Packages-arch-specific really need to buffer lines?

[*] Improve junk.sh to check the exit code of quinn diff and do clever
    things if it fails (e.g. try another mirror)

[*] Re-add version number comparsions optionally

[*] Variable (printf style) output format?

[*] Documentation.

[*] Test suite.
