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

[Jay Belanger]

> In Calc type
>
> 'e T m^2 / hbar
>
> Convert this to SI units with u c si RET
> - That's perfect. We get a dimensionless number.
> Let's try again. In Calc type (more my range of numbers)
>
> 'e T nm^2 / hbar
>
> Now when we type again u c, Calc remembers what we did before.
> So as a unit it offers "default 1". Let's take this default.
> So just type RET
>
> Error: No units specified
>
> In other words: if an expression with units simplifies to a
> dimensionless number, Calc does not accept the unit "1", though it
> even offers this unit as a default for calc-convert-units.

The version of Calc in bzr Emacs will no longer offer "1" as a default.