review retrieveerrorsemantic contribution to avoid mail loss (cf. POP3
LAST)

clean up KPOP, SSL options

fix versions in features.html (6.4 vs. 7.0)

update README

check for other 6.2/6.3-specific documentation

merge libpwmd updates

fix versions 7.0/6.4/6.3.20 in fetchmail.man, want 7.0 for this release,
and 8.0 for C++

SSL fixes:
- write .man documentation, adjust FAQ (check diffs for what needs to be
  documented)
- debug sslcertck default (gets disabled somehow)

Debian #632479 - doesn't accept -f and --pidfile options when waking up
BG daemon (watch out for idfile though!)