Inconsistent use of debug macros in board definition files resulted in
BU compilation error. It was attempted to use PIOS_COM_SendFormattedStringNonBlocking()
directly even if PIOS_COM was not included (like for BootloaderUpdater).
So this function in pios_debug.c was replaced by DEBUG_PRINTF() macro.
The macro itself is defined in pios_debug.h file. Its definitions are
removed from board files. And to use it one has to define in pios_config.h:
#define PIOS_INCLUDE_DEBUG_CONSOLE
#define DEBUG_LEVEL <number>
in addition to PIOS_INCLUDE_COM with aux port.
Conflicts:
flight/PiOS/Boards/STM32103CB_PIPXTREME_Rev1.h
flight/PiOS/Boards/STM32F4xx_RevoMini.h
