Modernize function implementations and docstrings in scripts/time. * addtodate.m: Add millisecond functionality. Update docstring and %!tests. * calendar.m: Implement faster way to add '*' to day display. Update docstring. * weekday.m: Use more modern coding stytle. Update docstring. * asctime.m, clock.m, ctime.m, date.m, datenum.m, datestr.m, datevec.m, eomday.m, etime.m, is_leap_year.m: Update docstring and/or use Octave formatting spacing conventions for %!tests.

--- a/scripts/time/datevec.m
+++ b/scripts/time/datevec.m
@@ -34,7 +34,7 @@
 ## @var{p} is the year at the start of the century to which two-digit years
 ## will be referenced.  If not specified, it defaults to the current year
 ## minus 50.
-## @seealso{datenum, datestr, date, clock, now}
+## @seealso{datenum, datestr, clock, now, date}
 ## @end deftypefn
 
 ## Algorithm: Peter Baum (http://vsg.cape.com/~pbaum/date/date0.htm)