Updated the gateware with integrator loop input rounding

Set up for beam operation. In ramping with phase rotation we find the tuner
loop issue (cav. 2) with asynchronous data on probe and forward that can
lead to large errors. Current tuner loops stop after commanding a move, so
that one glitch can lead to an abort.

Next we find that with 20 mA of beam current loading is large enough that we
need to lower tuner loop gains from 23 to 2.

Lowered high setpoint from 0.702 to 0.67 due to output saturation due to
beam loading. Need higher klystron supply to run 20 mA without saturating
the LLRF feedback output.

Next we tried a phase jump of 1 degree at position 180 (1:512) in the ramp.
Recorded the excited motion using the LFB with external trigger (153301).

