Now libopencm3 compiles support for the f3, also Makefile.stm32 updated
quadrotor xml update to use spektrum receiver instead (this is temporary)
Stm32f3discovery: LED clock bus fixed
[Stm32f3discovery] usart sr register in f3 is usart_isr
[stm32f3discovery] Memory size 256Kb
[stm32f3discovery] LED list fixed
[stm32f3discovery] i2c arch support added