- Bringing changes over from kde3 branch.
- This fixes the Treo 700p (and other devices) by bringing back the pre-device-comm-thread approach, while still maintaining the fixes I brought in with the non-GUI thread for device comm.

Namely, we still use a thread to do all the low-leve comm work, but instead of looping, we allow 2 paths: 1) a timer fires, which means we couldn't re-establish comm, or 2) a QSocketNotifier tells us that there's data available on the HotSync port.