bug#10554: 24.0.92; No units specified (dimensionless quantities in Emacs Calc)

[Jay Belanger]

>> But what /should/ happen?  Would you like an error signaled?  Otherwise,
>> the current behavior is the most reasonable.
>
> I would, indeed, consider it quite OK if an error was signaled. Say,
> if there was an option calc-throw-error-if-units-mismatch, I'd bind
> it to t.

Having such an option shouldn't be too hard to take care of, after 24.1
comes out.  By default, though, the current behavior shouldn't change,
and so the option should have default value nil.

Jay