[Rd] Improvement of SignRank functions

[Ivo Ugrina]

Hi Martin,

Martin Maechler wrote:
> that's quite convincing; thank you!
> and I can verify part of it on my computer.
:D

> I think I'd just commit your signrank.c
> (with a few cosmetic changes) to the sources, right?
Right!

There is no need for SIGNRANK_MAX in src/nmath/nmath.h anymore.

> Thank you for your contribution!
You're welcome.

With respect,
-- 
Ivo Ugrina
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