Have make realclean nuke everything in the builddirs
Argh just w/s
Fast PARITY templates and some currently unused type selecting stuff
The P3Atom, with 16 bits of ECC type.  Part 1/3
Tests for 2D 4x4 parity, used by the P3Atom.  Part 2/3
Not quite first use of P3Atom.  Part 3/3