Updated monitors in DAQ software

Created a monitor for the Key Rate (Log2[2/(e*EPR)], and performed a
general tidy up of the DAQ software (cleaned wires etc.).
Created new DAQ subVIs

Deleted graphs showing signals and created a new graph for observing the
key rate in real time. Ran the experiment today and found the key rate
monitor to be very useful.
Also, updated the time and date on the PXI chassis for text parameter
file.
Successful data run and DDS clock

We ran the experiment and took data with the loss channel installed.
Ollie played with clock generation for the DDS board.