[OctDev] new material in main/optim

[Michael C. <mic...@ua...>]

Hello all,
I have added some files for optimization into main/optim, in the subdirectory 
"Optimize". I created a new subdirectory, since the files have some 
interdependencies between themselves, and the set of necessary files wouldn't 
be clear if they were put directly into optim.

The BFGSMin.m routine, the file of central interest, is much like bfgs.m in 
optim, but, in my experiece, it is more efficient and robust, since the line 
search for the stepsize has been re-worked quite a bit. It has been tested 
quite extensively. It also has a somewhat different interface that makes use 
of cell arrays. Thus, it doesn't require "leval" and will not generate 
warnings with Octave > 2.1.50. The Optimize package has no dependencies on 
octave-forge - it will work with plain Octave 2.1.x.

Any comments appreciated. Please leave the flamethrowers on low if I've make 
any errors with CVS - it's the first time I attempt a commit. Michael