v0.7.0: development release

This release adds a minor feature, and includes a re-work of some base functionality
(which should not affect most use cases).

• dinitctl "restart" command added. Re-starts an already-running service without affecting
  activation or dependency links.
• dinitctl "stop" command now requires a --force option if dependents of the specified
  service would also need to stop.
• dinitctl "wake" command now reconnects dependency links from dependents of the specified
  service, and can only be used if at least one such dependent is started.