use device id to decide adc resolution
added rs232_7e1_*

missing implementation in interrupt handlers, copied from rs232_8n1
RS232_7E1_TX

done for test
rs232_7e1_tx works now
rename kamstrup multical to iec 61107
multical -> IEC61107
IEC61107/IEC62056-21
Kamstrup IEC 61107 doc

for kamstrup 382
rs232_7e1_rx working
no DEBUG_RS232_*_RX
truncate data to 7 bit
missing check for parity bit/ 2. stop bit

logic must be false
fixed rx timer int logic for databits/parity/stop
debugging