Repair n taper defaults

[tensionhead]

Changes Summary

• comparison with FT unmasked errors in the default Slepian/multi-taper settings
• minimal bandwidth was a factor of 2 too big
• dpss settings were wrongly calculated from padded signal lengths

Reviewer Checklist

• Are testing routines present?
• Do objects in the global package namespace perform proper parsing of their input?
• Are all docstrings complete and accurate?
• Is the CHANGELOG.md up to date?

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.15% 🎉

Comparison is base (d8d7a8b) 68.88% compared to head (59aa767) 69.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #559      +/-   ##
==========================================
+ Coverage   68.88%   69.03%   +0.15%     
==========================================
  Files          87       87              
  Lines       10118    10122       +4     
  Branches     2124     2125       +1     
==========================================
+ Hits         6970     6988      +18     
+ Misses       2564     2550      -14     
  Partials      584      584              

Files Changed	Coverage Δ
syncopy/specest/freqanalysis.py	66.06% <ø> (+3.63%)	⬆️
syncopy/connectivity/connectivity_analysis.py	84.31% <100.00%> (+0.31%)	⬆️
syncopy/shared/input_processors.py	57.50% <100.00%> (ø)

... and 1 file with indirect coverage changes

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