Pysense 9uA in sleep

[catalin]

Hello community,

We have just updated the Pysense micropython library, so in sleep mode, it consumes just 8-9uA (@3.7V battery JST connector) with Fipy/Lopy4/Gpy/Wipy.
Pysense lib: https://github.com/pycom/pycom-libraries/tree/master/pysense
PIC lib: https://github.com/pycom/pycom-libraries/blob/master/lib/pycoproc/pycoproc.py