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connection object.

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zero_border_pixels() functions.  Their contracts said there was no upper limit on the
size of the border that could be assigned/zeroed but the implementations failed to
handle the case where the border was bigger than the image.

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so that it is a little more reasonable and also easier to understand.

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the way a bunch of requirements were written.  I also added missing
assert statements to the randomize_samples() functions.

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objects to allow you to get the kernel type out of them.  I also removed some extraneous
get_kernel() functions from some of the trainer adapter classes since they really aren't
needed.

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matrices with many more columns than rows.

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Now vector_to_matrix() and array_to_matrix() produce matrix expressions
that return their elements by reference rather than by value.

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