Bug fix for configuring LEMO's debug signals

See merge request !4

Added function to read back the VTU sync delays for each RF channel and also the calibrated/reference delays.

Added registers for WR RFframe timestamps, atomic updates of IQ phase/ampl settings and changed 19bit VME access space

Added code to initialise the trigger unit delay lines and avoid restarting the…

See merge request !3

Added code to initialise the trigger unit delay lines and avoid restarting the LT6950 PLL if already started.