Fixes to device-manager

[Artem Kachitchkine]

Joe,

> * DeviceManager.py  : Connect signal handlers after initializing the
> device tree, otherwise GetAllDevices() blocks for 25 seconds in
> dbus_pending_call_block() (no
> idea why).

Sounds like the bug in D-BUS Python bindings that John fixed a while back:

http://lists.freedesktop.org/archives/hal/2006-March/004708.html

It's in the HEAD, but not in a release. 0.62 is
overdue.

-Artem.