[Remind-Fans] issue warnings for impossible UNTIL ranges

[Ian! D. Allen]

Could remind be coaxed into issuing a warning for impossible constant date
"UNTIL" and "THROUGH" ranges such as:

    REM Mar  1 2022 *1 UNTIL Mar 30 2021 MSG test

I recognize that some calculated dates may legitimately produce start
dates after end dates, but no constant date strings should do this and
I'd love to have a way for remind to tell me I made an error.

-- 
| Ian! D. Allen, BA-Psych, MMath-CompSci  idallen at idallen.ca Ottawa CANADA
| Home: www.idallen.com  Contact Improvisation Dance: www.contactimprov.ca
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