Various tiny enhancements flake etc demanded

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (bf9b75b) 82.00% compared to head (1215a2c) 82.00%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #702 +/- ## ======================================= Coverage 82.00% 82.00% ======================================= Files 41 41 Lines 4130 4130 ======================================= Hits 3387 3387 Misses 743 743 ``` | [Files Changed](https://app.codecov.io/gh/nipy/heudiconv/pull/702?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipy) | Coverage Δ | | |---|---|---| | [heudiconv/heuristics/reproin.py](https://app.codecov.io/gh/nipy/heudiconv/pull/702?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipy#diff-aGV1ZGljb252L2hldXJpc3RpY3MvcmVwcm9pbi5weQ==) | `84.88% <100.00%> (ø)` | |

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[github-actions[bot]]

:rocket: PR was released in v1.0.0 :rocket:

[github-actions[bot]]

:rocket: PR was released in v1.0.0 :rocket: