make suppression factors and eigenval cutoff options optional.

[aewallwi]

Make the suppression_factors arg in dayenu_filter and _fit_basis_2d/1d optional and also pass tol as an optional arg to these functions. if supression_factors is not provided, then use tol to set the same suppression factors in all fourier windows specified in filter_centers and filter_half_widths.

Also make the eigenval_cutoff and other series termination args in dpss_operator optional. If no cutoff is provided, use a cutoff of 1e-12 for all filter_centers and filter_half_widths.

[codecov]

Codecov Report

Merging #131 (379f9ee) into main (551b0da) will decrease coverage by 0.33%.
The diff coverage is 77.41%.

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
- Coverage   87.81%   87.48%   -0.34%     
==========================================
  Files           7        7              
  Lines        1502     1518      +16     
==========================================
+ Hits         1319     1328       +9     
- Misses        183      190       +7     

Flag	Coverage Δ
unittests	87.48% <77.41%> (-0.34%)	⬇️

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Impacted Files	Coverage Δ
uvtools/dspec.py	97.00% <77.41%> (-0.77%)	⬇️

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