Maintain minor things

[tfiedor]

1. This increases coverage a little,
2. Fixes minor issues,
3. Extends formatting of logs.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.11%. Comparing base (1d29db0) to head (5502672).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #217 +/- ## ========================================== + Coverage 98.91% 99.11% +0.20% ========================================== Files 144 144 Lines 9932 9929 -3 ========================================== + Hits 9824 9841 +17 + Misses 108 88 -20 ``` | [Flag](https://app.codecov.io/gh/Perfexionists/perun/pull/217/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Perfexionists) | Coverage Δ | | |---|---|---| | [coverage-3.10](https://app.codecov.io/gh/Perfexionists/perun/pull/217/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Perfexionists) | `99.11% <100.00%> (+0.20%)` | :arrow_up: | | [coverage-3.11](https://app.codecov.io/gh/Perfexionists/perun/pull/217/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Perfexionists) | `99.10% <100.00%> (+0.20%)` | :arrow_up: | | [coverage-3.12](https://app.codecov.io/gh/Perfexionists/perun/pull/217/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Perfexionists) | `99.10% <100.00%> (+0.20%)` | :arrow_up: | | [coverage-3.9](https://app.codecov.io/gh/Perfexionists/perun/pull/217/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Perfexionists) | `99.10% <100.00%> (+0.20%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Perfexionists#carryforward-flags-in-the-pull-request-comment) to find out more.

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