Log Message:
Update to 0.63 (required by the upcoming dvd::rip).

Features:

- Improved output layout of Event::ExecFlow::Term.
- Event::ExecFlow::Frontend::Term->set_quiet(1)
  will print just warning and error messages.
- Added method Event::ExecFlow::Job->reset()

 Bugfixes:

- Increase group progress on child finish only when
  it was successful.
- Group considered itself finished even when a child
  job didn't finish successfully (cancelled or error).