Patch to qp() to support extra arg specifying maximum iterations

[John W. Eaton]

On  1-Feb-2009, Ben Abbott wrote:

| I tried to merge your changes, and modified the proper ChangeLog.  
| Using the final result, the first test fails for me (I've attached the  
| changeset).

Instead of adding options as individual arguments, I think we should
be using optimset.

jwe