conv.m and MATLAB incompatibility.

[Robert T. Short]

Attached is a patch to conv.m that fixes a MATLAB incompatibility.  I 
also added a couple of tests.

Summarizing:  if the input vectors are the same length, but one is a row 
vector and the other is a column vector, the octave version returns the 
correct answer but with a different orientation than MATLAB.  In other 
words octave will return a row vector when MATLAB returns a column 
vector and octave will return a column vector when MATLAB returns a row 
vector.


WARNING.  APPLYING THIS PATCH COULD CAUSE SCRIPT BREAKAGE!

Scripts that depend on the row/column nature of the result will no 
longer work.  This might be a good reason not to apply this patch.  
Folks (like me) that want MATLAB compatibility can keep this version in 
their path.

Bob

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