Changed the LSM303 config behaviour. Stopped it setting up the FIFO, as that seems to limit Accel output to 10-bit.
Also modified Accel Set Range, so that it also sets the 'high resolution' bit.
Moved setting of the High Resolution bit of the accel, into the accel configuration.
Changed behaviour of the accel set range function, to read current register, reset the scale bits,
then to OR the new scale bits.
pios_lsm303: renamed MAX_DOWNSAMPLE to MAX_QUEUESIZE and increased value to 2
pios_lsm303: removed queue registration for consistency with the rest of the project
pios_lsm303: removed commented code