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

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

[codecov[bot]]

Codecov Report

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

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

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/esi-neuroscience/syncopy/pull/559?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=esi-neuroscience) | Coverage Δ | | |---|---|---| | [syncopy/specest/freqanalysis.py](https://app.codecov.io/gh/esi-neuroscience/syncopy/pull/559?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=esi-neuroscience#diff-c3luY29weS9zcGVjZXN0L2ZyZXFhbmFseXNpcy5weQ==) | `66.06% <ø> (+3.63%)` | :arrow_up: | | [syncopy/connectivity/connectivity\_analysis.py](https://app.codecov.io/gh/esi-neuroscience/syncopy/pull/559?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=esi-neuroscience#diff-c3luY29weS9jb25uZWN0aXZpdHkvY29ubmVjdGl2aXR5X2FuYWx5c2lzLnB5) | `84.31% <100.00%> (+0.31%)` | :arrow_up: | | [syncopy/shared/input\_processors.py](https://app.codecov.io/gh/esi-neuroscience/syncopy/pull/559?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=esi-neuroscience#diff-c3luY29weS9zaGFyZWQvaW5wdXRfcHJvY2Vzc29ycy5weQ==) | `57.50% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/esi-neuroscience/syncopy/pull/559/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=esi-neuroscience)

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