pios_hmc5883: removed duplicate creation of data_ready_sema
quanton: handle returnvalue from PIOS_HMC5883_Init
flyingf4: handle returnvalue from PIOS_HMC5883_Init
quanton: handle returnvalue from PIOS_MS5611_Init
flyingf4: handle returnvalue from PIOS_MS5611_Init
quanton: moved PIOS_SENSORS_Init before uart inits
flyingf4: moved PIOS_SENSORS_Init before uarts init
pios_hmc5883: put value read and retriggering into one i2c transaction