Add lambda helpers and finish BIST test code.
LFSR calculation of ideal BIST register values.
Bring run_DAC_BIST up to the library and fix some syntax errors.
Predicate is called first so the true vector should be odd.
Byte order in data sheet seems to be backwards.
Have to set_waveform to get the channel filled it.

TODO: on CH B need to fill in A or perhaps waveform mode should take the longer.
Fill in some more functions in Julia wrapper.