kargl c519d48b44 Implement the long double version for the cube root function, cbrtl.
The algorithm uses Newton's iterations with a crude estimate of the
cube root to converge to a result.

Reviewed by:	bde
Approved by:	das
2011-03-12 16:50:39 +00:00
..
2011-03-07 03:09:24 +00:00
2010-12-05 22:11:22 +00:00