write.mon.complete(): formatting of output: trailing 0s included, timestamps with fractional seconds
format.header():
Fixed bugfix -- connection was closed, but no data returned.
Matched amount of whitespace in "BEGINNING..." header to original.
Changed default for created.by.diveRlib -- won't import into Diver Office with "wrong" Creator value.
Defined format string for start/end times in header: mon.header.datetime.format.
Old mon.datetime.format (for logging data) renamed to mon.data.datetime.format.

read.mon.complete() didn't yet use pre-defined format string, fixed that.