kawa numerics unstable

[Per Bothner]

I'm making some changes to Kawa numerics that make
break some code and cause other code to be slower.
One goal is to generalize Kawa arithmetic so it
handles the standard java.lang.Number classes in
addition gnu.math.*.  Another is to optimize and
inline more functions.  On change I just checked in
is that when ant 'int' is convert to an Object, we
get a java.lang.Integer, not a gnu.math.IntNum
This should make Kawa a little more consistent with
Java in general, including reflection and varargs.

This is related to my attempt at writing Kawa ports of
the benchmark programs at http://shootout.alioth.debian.org/
with the goal of showing off Kawa's performance more widely.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/