[bigint] A patch for Bigint operators to provide consistent behavior

[Alexander Shaduri]

Hello,

First, I'd like to thank you for your excellent Big Integer library!

I had some trouble using the BigInteger type with some template
libraries, since the overloaded operators don't really behave like
the built-in ones (for int, for example). That is, they don't have the
correct return values - most of them return void.

I'm attaching a patch which makes the operators consistent
with the the ones of built-in types. For me, this patch fixed some
problems with generic template libraries which expect the operators
to be present and have built-in-like signatures. It also fixed a compiler
error of Visual Studio 2008 when using std::complex<BigInteger>.
Also, it allows the user to use BigInteger as a drop-in replacement
in statements like:
a = b = c = d;
a = ++b;
and such.
I hope you find this useful and merge it upstream.

Thanks,
Alexander
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