v0.8.0: development release with usability features

This release includes major usability features.

• New command "dinitcheck" checks service descriptions for errors (without attempting to load
  or start the service). Checks the named service(s) and any dependencies.
• Service descriptions can now be reloaded, using "dinitctl reload service-name". This works
  for services which are started, with some restrictions, and for services which are stopped,
  and allows dependencies to be altered.
• dinitctl now defaults to the system process socket location when run as root. This means that
  using '-s' is no longer necessary (it is still supported for backwards compatibility). A new
  '-u' option can be used to communicate with the user daemon, if there is one.