[python-dbus] Really fix the thread interaction with glib mainloop
[python-dbus] Typo
[python-dbus] Make sure we can subscribe to events via their IDs
[python-dbus] Do not aggressively remove existing event filters

This prevents several aseba DBus client to run simulteanously.
It however now mandate clean closing of the Aseba object, either via
Aseba.close() or (better) with a  clause.
Merge pull request #320 from severin-lemaignan/master

A few python-dbus fixes