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Added stack-cols (with tests).
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).
Added outer product.
Made fill-in-dimensions accept dimension specifications.
Fixed dimension specification in recycle.
Now accepts all forms that are accepted by ensure-dimensions.
Added NROW and NCOL.
Added shorthand functions.
Generalized dimension specifications.
Added RECYCLE, with tests.