New test for LC_NUMERIC

[Petter Reinholdtsen]

[Ulrich Drepper]
> You cannot just replace the test.

I know.  If you notice the file names, I was just showing how little I
changed compared to the tst-fmon.c file.

> The monetary and numeric information is independent and should be
> tested both.  So, extend the test, don't replace it.

I think it is better to make a new and independend test, modeled like
the strfmon test.  You should already have the patch.