General:
- the maxzero and maxone parameters are now determined dynamically, remove
them from config.txt and README.md
- Do not consider time offset jumps if bit 17 and 18 are equal
readpin:
- add a -q parameter to suppress displaying of the raw signal (default off)
- display updates
dcf77pi:
- display updates/fixes, show radio state
(OK if no receive/transmit/random errors)