[phobos] BigInt from Tango

[Don Clugston]

On 19 March 2010 04:46, Don Clugston <dclugston at googlemail.com> wrote:
> I've converted my BigInt module from Tango to Phobos2. It's a great
> test of the new operator overloading!
> After 2.042 comes out, I'd like to add it to Phobos.

OK, it's now in. There are still some obvious things wrong with it
(not all of the formatting options are supported, for example), and
the internal stuff doesn't take full advantage of D2 yet. Nonetheless
it works.

The modules
	std\internal\math\biguintcore.d
	std\internal\math\biguintnoasm.d std\internal\math\biguintx86.d

will need to be added to the Linux and OSX makefiles.