Use logging lib for messages

[Ernest0x]

Instead of just calling print() to print messages, I would suggest to use the logging library for better logging capabilities, such as different logging levels (info, warning, error, debug), timestamps, log to syslog or other handlers, etc. For start, a simple handler to write to sys.stdout can be implemented.

What do you think?

[ThomasWaldmann]

Esp. for RemoteRepository debugging this could be useful.

Sometimes stuff behaves strangely, but only if it is remote. Tracebacks are not visible.