Allow block multiplication of non-square blocks #127
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Currently, BlockDiagonals keeps the block structure in matrix multiplication only if the blocks that are multiplied together have the same size. This is overly restrictive and rules out multiplication with non-square blocks.
This PR modifies the check done when multiplying BlockDiagonals to permit multiplication with non-square blocks while retaining the block diagonal structure.
In addition, the overhead of checking if blocks can be multiplied or added has been reduced.