Make the field of the year 4 digits wide.
Prevent realfreq from being pulled down (or up!) too much during e.g. a thunderstorm.
Port dynamic realfreq algorithm from readpin.c

Log realfreq resets as '<' and '>' in normal mode and to the log file,
or in banner-style in verbose mode.
Show realfreq and 'a' in verbose mode.
Fix typo
Remove the now unused realfreq parameter