[Rd] Minimum of an ordered factor

[Thaler, Thorn, LAUSANNE, Applied Mathematics]

> Martin Maechler writes
> I have now committed the amended proposal (rev 53925);
> thank you for the feedbacks..

I had a look at it and there is a typo:
	
stop(gettextf("'%s' not defined for \"difftime\" objects", .Generic),
domain = NA)

should rather be

stop(gettextf("'%s' not defined for ordered factors", .Generic), domain
= NA)

BR Thorn