Rev 1.0 awkward rounding voltage

[jfrazao]

Rev 1 hardware does a Awkward voltage quantization rounding (from bonsai to pulse pal) that doesn't follow any of the comum approaches (flooring or ceiling to the closest quantum, or to the biggest, or smallest, or even).
Example rounding bonsai to hw:
5.2v to 5.16
5.21 to 5.16
5.22 to 5.23

This issue may be related to how the scale is defined on this version of the HW.

pulse pal rev1 byte to voltage correspondence:
000 to -10.0v
127 to 0.0v
255 to +9.92v
256 to +10.0v