Dumping a lot of new FPU-related changes in a new branch

A/UX doesn't even come close to booting yet with the new FPU,
but we're getting there. I don't want to trash master with
a code base that doesn't work. Also, I turned off ethernet
in the cocoa GUI, since the TAP driver isn't working right
on 10.10 yet.
Added a bunch of disassemblers for newfpu
Implemented fmovem_control()

I'm on a roll
Newfpu works enough to "boot" A/UX

... but that's not saying much
fmovecr now actually works

a cursory boot of 3.0.0 didn't reveal any asserts, except for x11. And I'm sure Marathon will die, and Mathematica, etc. Calculator works though. IE 2 hangs, and finder shutdown crashes.

... getting there
Marathon works!

Fixed a bunch of dumb bugs, and now newfpu is working almost as well as old-fpu.
Presumably it's also running much more slowly, but I'm not noticing a speed difference.
Implemented frem, fmod, fsglmul/div, and fixed fabs

- And also fixed an assert
- New frem impl is slower, but easier to get the quotient bits.
Finished the native-half of the transcendental impls

... for x86. Remains to be seen whether this will *really*
work on PowerPC or other architectures.
Implemented fsin,fcos,ftan,fatan,fasin,facos

Not sure if they work exactly right yet - xeyes is messed up,
but xclock seems to work.
Implemented flog2, flog10, and flogn, fixed fneg

xeyes works now
Implemented fatanh,cosh,etox,etoxm1,lognp1,tanh, and twotox

but not ftentox, because this hits a clang bug. Clang 3.5
(and earlier?) wants to optimize pow(10.0, x) to
__exp10(x), but __exp10() doesn't exist in the 10.8 SDK,
so the linker fails. There's probably some simple workaround...