Fix issues found during commissioning

Hi @amunnich ,

The following are fixes of issues that were found during testing at SQS with POD.

These are 3 parts:

• On one hand, I had mistakenly set the maximum spectrum size to 2048, which meant that the DAQ was dropping data when acquiring larger spectra.
• The connectDevice import was missing, and thus could not connect to the POD device.
• Configuring the POD turns out to be different from what we'd expect:
  One has to set actualBunches to 0 (by doing targetBunches = 0 and call setBunches),
  Then set targetBuches = 1, Finally call start every time.

These changes were tested at SQS with David Lomidze.
Data was successfully recorded, and it's now all running as expected.

Thanks! Cyril