Adding past records via move

[MaximLeyenson]

Currently, it is really hard to add past records due to the unintuitive ISO-8601.

One way around it would be to create a dummy interval, and move it to the past:

$ timew start <something-important>
$ timew stop
$ timew move @1 -20h
$ timew lengthen...

Hence, I am suggesting the ability to move an interval by "- 20 hours", or "- 2 days".

See also the following discussion, on the difficulty of adding forgotten entries.

Thank you for your attention, and for developing timewarrior!