* Written Unified Sherman-Morrison-Woodbury kernel that partitions
the updates in blocks of 3 and tries them with Woodbury 3x3.
The remainder of 2 or one are attempted with Woodbury 2x2 and SM2.
For now the unified kernel gives fails where pure SM2 does not.
I suspect there is something going wrong in how the updates are partitioned.
- It can serve as a baseline reference
- It can serve as a starting point for including the pivot
and splitting techniques from Maponi and Slaggel without the full
complexity of the MaponiA3 algorithm
