Some variables used in this script. This section is informational
only. The variables get set in different places in the script. Some
are entered on the command line or during the running of the script.
The only user configurable variable in the file is taskfer_dir.
duedate = the date you enter
repeats = number of times a recurrent event is repeated.
cycle = time between recurrent events; day, week, month, year.
days = number of days you enter for the -w option
line_num = line number
beginday is today at 00:00:00
ddt is the due date converted to yyyy-mm-dd
day0 is the beginning of today converted to seconds.
day1 is some other date converted to seconds, for date arithmetic.