[api] add Ubuntu 12.04 and remove 10.10 as it is EOL
[dist] document how to use filesystems on backend
[dist] do not listen on port 443 by default, it breaks on fresh installations
[backend] it's SOLV_KV_NUM64, not SOLV_KV_NUM...
[backend] add $BSConfig::maxmetahardlink to work around btrfs hardlink limitation
[backend] implement 60 second timeout to receive the request
[backend] send back empty lastevent reply after 5 minutes
[backend] fix error msg when using external tool.

  Fix typo on error message when using external publisher program.

Signed-off-by: Hector Oron <hector.oron@collabora.co.uk>
[backend](deb) Add Sources files to Release file.

  On Debian style repositories include Source and Source.gz as part of Release
  file.

Signed-off-by: Hector Oron <hector.oron@collabora.co.uk>
[dist] Use .log instead of _log for apache logs so they're covered by the logrotate config