[COMMIT] Add `float-time', implemented in Lisp.

[Jeff Sparkes]

 Ar an fichiú lá de mí Bealtaine, scríobh Jeff Sparkes:

>
>  > [...] (Unfortunately, there's another incompatibility that prevents me
>  > from using midnight.el unchanged: float-time. I'm using org-float-time
>  > locally)
>
> I’ve just added this, partly to test that the incoming hook does the right
> thing with merges.
>
>  Here's a patch add an entry to lispref.   I just copied the text from GNU
lispref texinfo.
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