Moved to decoding, see org.jlab.detector.decode.DaqScalers
See https://logbooks.jlab.org/comment/14616
The EPICS equation for converting fcup scaler S to beam current I:
I [nA] = (S [Hz] - offset ) / slope * attenuation;
The (32 bit) 1 MHz DSC2 clock rolls over every ~35 minutes. We
instead try to use the (48 bit) TI 4-ns timestamp, by storing the
first timestamp in the run.
Probably this will have to be done post-processing, e.g. in trains,
where we can process the full run in one shot.
FIXME: Use CCDB for GATEINVERTED, CLOCKFREQ, CRATE/SLOT/CHAN