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as customer deleter functions.

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any likely name collisions with user's code.

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aren't empty.  Previously this was technically allowed and worked but was
weird.  The optimization I checked a few hours ago also breaks when empty
matrices are multiplied together so I'm just adding this new requirement.

I also had to fix a part of the LU decomposition because it was doing an
empty matrix multiplication at one point.

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normalizer a template argument (with its default set to the vector_normalizer
so this change doesn't break backwards compatibility).

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to optimize it a little more.

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assignment loop if it is small and known at compile time.

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when used with mixed matrix and vector objects.

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eat exceptions thrown by event handlers rather than letting
them propagate out as documented in the specification.

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output logging destination (in addition to the std::ostream supported already).

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particular, I removed the enumerator over blocks in favor of a simple
get_blocks() function that just returns a std::vector of all the blocks.
I also removed the requires clauses on the block and key accessor functions
and instead made a request for a non-existent key/block result in a non-fatal
exception.  This way users can let the config reader perform a more natural
role in config file validation (by catching this exception and acting accordingly).

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I also changed a matrix test case to be more robust.

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that you can get from gcc in certain cases.

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computing a properly weighted Gaussian function.

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