Added --mysql and a branch raspberrypi for --led output

Hi Salvatore !

I added an option to feed a mysql database (--mysql) and placed some scripts and a webpage at tools/mysql. There's also a subbranch "raspberrypi" which makes usage of the GPIO port of the Raspberry Pi using the "wiringPi" API. I added code to drive two LEDs (--led) for now for frame indication and indication of position data (DF17).

73 Oliver