The progress arg to push, pull, fetch and clone is now a python callable.

This simplifies the API and removes the parser, RemoteProgres,
from the API as RemoteProgress is an internal detail of the implementation.

progress is accepted as:
* None - drop progress messages
* callable (function etc) - call the function with the same args as update
* object - assume its RemoteProgress derived as use as before

RemoteProgress takes an optional progress_function argument.
It will call the progress function if not None otherwise call self.update
as it used to.

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