v3.0B Scalar CR instructions (crand, crxor) only allow a single bit calculation, and both mtcr and mfcr are CR-orientated rather than CR *Field*
orientated.
-Also strangely there is no v3.0 instruction for moving CR Fields,
+Also strangely there is no v3.0 instruction for directly moving CR Fields,
+only CR *bits*,
so that is corrected here with `mcrfm`. The opportunity is taken
to allow inversion of CR Field bits, when copied.