suzerain: specify baseflow unused variables

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44643 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2998 clear 00 mode for twopoint

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suzerain: complex_field_read/write

These were previously file-static but have been
made public.

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suzerain: #2998 return to complex storage

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suzerain: remove useless exclude

In the invocation here, only the named dataset is compared.

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suzerain: #2998 enable spectra output

Also, update tests to ignore minor differences from parallel reduction
in the now-output /twopoint_kx and /twopoint_kz.

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