Rcontrol

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- finished_callback, timeout_callback, stdout_callback and stderr_callback
from command parameters are renamed to on_finished, on_timeout,
on_stdout, on_stderr. Old names are still working for compatibility,
they will be removed later - runtime warnings are issued for that.
- session.wait_for_tasks now wait for tasks that are started from other
tasks callbacks

==================

- keep silent errors around (errors that happened on tasks finished
without explicit wait call)
- add a copy_dir method on Session objects
- add synchrone methods for copying files and directories
- fix exception handling in ThreadableTask
- add licence infornation (LGPL)
- update documentation

==================

- fixed a bug with remote tasks (python typo)
- remove task that timed out from the session tasks
- update documentation

==================

- initial release