Revive arbitary VApply.
Rename VApplyQ/V to VUnaryQ/V similar to Apply.hs.
VUnaryQ and VBinaryQ.
Binary and binary to unary for vectors.
Generic ApplyC.
ZipRowsWith, Zip, and new mZipWith.
Zip rows to elements, zip columns.
Rewrite mMap in terms of mMapRowsV.
Matrix multiplication.
Dyadic product.
Identity matrix. MHomo.