adc: added min_switch_interval_ms config option.
adc: renamed TSysfsADCException -> TADCException.
adc: fixed error handling.
adc: added 'debug' option in the config and -d command line switch.

Don't output any debug print unless one of these is set.
adc: publish all 8 ADC channels.
adc: publish .../meta/order for channels.
adc: fixed compile error on the target system.
adc: updated debian package to include wb-homa-adc config & init script.