On-Orbit Data Shows Week Number Floor'd to 2000

[shihaocao]

2000 is the lower bound on the serializer for the GPS week number. This likely means that for whatever reason the week number in the piksi.time state field is being set to 0, or is potentially being modded to a value well below 2000 per this stack overflow ticket: https://gis.stackexchange.com/questions/281223/what-is-gps-epoch

Todo:

Perform a teensy HITL with the piksi attached, obtain a real fix from the real world, and see what time our flight software thinks it is by repeatedly printing out the contents of a rs piksi.time call in the command line, or through print_rs of that state field in ptest.