Revert "Replace 4x8 lapping filter with a V matrix with a determinant of one."

This reverts commit cc6a79312d600608f5027ca5b45c82636e5a5367.

Conflicts:
	src/filter.c
Reduces ringing at the expense of less details

We both increase RDO and bias switching towards 4x4. This also compensates
for the scaling changes of the det1 revert. Compared to the code before the
det1 revert, metrics say:

           RATE (%) DSNR (dB)
    PSNR -5.32475 0.395669
 PSNRHVS 3.52992 -0.324017
    SSIM -0.956758 0.0521953
FASTSSIM 7.34432 -0.260151
Correctly return failure on all failed tests in ectest.

Some tests previously complained about the failure in the output
 but didn't set the exit status.
Increasing the Cb quantization resolution to reduce yellow chroma artefacts
Adds training code for spherical quantizer