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Added stack-cols (with tests).
Added test for incompatible dimensions.
Made check for atoms only more elegant.
Added row stacking, with tests.
Added corner case.
Cosmetic fix (removed duplicate).
Made TRANSPOSE generic.
Removed matrix and square-matrix types, cleaned up general interface.
Reordered export list.
Added default fallback.
Reworked the general interface.
Now everything falls back to DIMS.
Added line breaks.
Made general functions generic.
Added default method for as-array.
Added matrix type.
Moved general operations into a separate file.
Renamed nick (ao->aops).
Cosmetic whitespace rearrangements.
Added tests for outer.
Rewrote tests to use clunit.
Added outer product.
Added note on stacking.
Minor corrections to README.
Added note about previous version.