Rationalise SystemInit() wrt PLL setup and clocking
run at 100MHz on LPC1768 instead of 96MHz
typo in figures for 100MHz, thanks to wolfmanjim
reduce N for 100MHz case by removing common factors
Merge pull request #255 from wolfmanjm/upstreamedge

fix a re entrancy bug in panel affecting menu
Merge branch 'feature/cleanup-clock-init' into edge
ignore commented lines in other consumers of on_console_line
Merge remote-tracking branch 'upstream/edge' into upstreamedge