cleanup for Linux
CProber::printf const char
Fixed errors caused by optimization on Ubuntu by disabling it. Also, fixed
a bug that would cause usb write errors on startup.
Merge branch 'wafertest' of https://github.com/frmeier/psi46test into wafertest

Conflicts:
	Makefile
Import of the current state of ethernet integration. Not working.
Finished Rudimentary Ethernet support. Enable by uncommenting the USE_ETHERNET define in pixel_dtb.h