[PYTHON MATRIX-SIG] Changes to diagonal and trace functions

[Jim Hugunin]

> I also still think that the generalized version of diagonal() and trace()
> that I posted a while ago would be more suitable than the current
> version that works only on rank-2 arrays. Here's my version again:
> <Real code removed>

I've always felt that these functions should be generalized to higher 
dimensions, but just never got around to it.  I am making the following 
changes to Konrad's implementation, best summarized by the new function 
prototypes.

def diagonal(a, offset=0, axis1=-2, axis2=-1):
def trace(a, offset=0, axis1=-2, axis2=-1):

This version has the advantage of being compatible with the current version 
of diagonal and trace, and also of behaving as I would normally expect for 
arrays of greater than two dimensions.

-Jim


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