Adding C++ TR29124.

[Ed Smith-Rowland <3dw4rd at verizon dot net>]

This patch is a clean up of the patch submitted by Jonathan in stage 1.
I am much less ambitious here than I was in previous patches.
I added many new test cases to the Bessel functions to look at the 
uncovered region near.
For TR29124 I moved the hypergeometric functions to __gnu_cxx namespace 
so they are not yanked away
from users.

We don't want to give anyone an excuse to use both TR1 and TR29124 at 
the same time ;-)

Hermite polynomials finally have value tests.
I also test the std:: TR29124
I replicated even the value tests even though currently, tr1 and tr29124 
point to the same implementation.
This will change as soon as stage 1 reopens.

Also, with TR29124 I think we could actually deprecate the tr1 namespace.

This builds and tests clean on x86_64-linux.

OK for stage 3?

On another note, I've staged new TR29124 implementation on a branch:
branches/emsr/gcc_tr29124 or some such.
I am staging new implementations and functions here.

Regards,
Ed

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