[OctDev] bfgsmin

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

There is a new version with the stepsize, numeric gradient, and finite 
difference code integrated into bfgsmin.cc. This simplifies the code, 
eliminates redundant error checking, and leads to about 15% better 
performance. There should be no numeric differences in results comparing 
to the previous version. The example file bfgsmin_example.m has also 
been updated. Please let me know if any problems are seen.
Michael