Makefile: adjust MCU speed define to crystal of 11.0592 MHz
Add clock (may need minor adjustment)
Add bh1750 light sensor twi@23.
Simplify edmp output to keep it inside the size of a packet's payload.
Correct signed/unsigned issue on tsl2560.
Fix tsl2561 reading at high intensities, now the high/low intenstity
modes can go, remove it (sensor 6 now becomes the bh1750).
sensors: make internal functions static.
Add bmp085 (temperature only for the moment), replace lm75
alternative address (sensor 3) with it.
Add raw value output to all sensors, improve calculations
(proper typecasting), improve text format output.
Rename tsl2560_read_quad function.
Replace very common twi error code by jump to label.
Add air presure measurement to bmp085.
Safer typecasting.
Remove unused function tsl2560_read (single).
More compact output (to fit in output packet).
Shuffle sensor index around for more compact code.