On receipt of first PPS, jam sync to it to remove clock offset
Work towards actually disciplining the clock
Some working NTP proto code
Really cheesy but working PLL (no FLL)
Do startup smarter:

First 60s after startup: PLL constant=10s, DDS only
Next 900s: PLL constant increases from 100 to 1000, Rb brought into play
Afterwards: PLL constant 1000s, Rb only unless there's a big jump
Not-quite-working FLL
Working much better
Change sequencing of ether_int to try to fix lost interrupts
Merge branch 'pll'

Conflicts:
	timer.cpp