monopt.html:

monopt.html:
  document timingstats (only available when daemon is compiled with DEBUG)
ntpd.h, ntpd.c, ntp_util.c:
  support collection of timing data
ntp_io.c:
  implement SO_TIMESTAMP for systems that have it
  support collection of timing data
  fix io signal blocking in refclock io handling functions
ntp_crypto.c:
  return OK when interface is not bound

bk: 447562fewFIRfiYAnOOu13_hYPb6Mw