[evlatests] sub-band to sub-band changes

[Michael Rupen]

We claim to be setting the requantizer gains such that the Psum for
all basebands and all subbands should be ~14.2  This seems to be
mostly working for the 8-bit, but not for the 3-bit side. 
This suggests we're not setting the requantizer gains at the right time
in the script -- e.g., we may be adjusting the requantizer gains and the
attenuators/gain slope equalizers at the same time, which would primarily
affect the 3-bit paths.  This would not explain the other 3-bit Psys
oddities of course.

              Michael

>    A quick perusal shows that the PSum varies remarkably from subband
> to subband, most notably in the 3-bit data paths (but also seen in at
> least a couple of the 8-bit paths as well).   Adjacent subbands, at the
> same time, will have PSum values different by up to 30%.  I see no
> evidence for a trend in PSum values across the 16 subband IF -- evidence
> that the slope filters are working about right.
>
>    This subband to subband changes should be visible in the bandpass
> solutions (if done 'absolutely', rather than normalized).  I'll check
> this next.
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