Cleanup and minor updates

[jgliss]

Some revisions and cleanups:

• [x] Set roi_abs in Image if it is set to default and image data are available
• [x] Deprecate _paths.txt shipped with pyplis (in pyplis/data dir) and always use ~/my_pyplis/_paths.txt
• [ ] Revise and simplify inout.py
• [ ] Add tests for inout.py
• [ ] Revise and update examples

[codecov-commenter]

Codecov Report

Patch coverage: 93.87% and project coverage change: +0.74 :tada:

Comparison is base (178f819) 35.26% compared to head (a7a1cf8) 36.00%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## v145dev #40 +/- ## =========================================== + Coverage 35.26% 36.00% +0.74% =========================================== Files 31 32 +1 Lines 12712 12659 -53 =========================================== + Hits 4483 4558 +75 + Misses 8229 8101 -128 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `36.00% <93.87%> (+0.74%)` | :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=Jonas+Gli%C3%9F#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/jgliss/pyplis/pull/40?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F) | Coverage Δ | | |---|---|---| | [pyplis/utils.py](https://app.codecov.io/gh/jgliss/pyplis/pull/40?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL3V0aWxzLnB5) | `49.51% <ø> (ø)` | | | [pyplis/image.py](https://app.codecov.io/gh/jgliss/pyplis/pull/40?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2ltYWdlLnB5) | `36.02% <33.33%> (-0.02%)` | :arrow_down: | | [pyplis/inout.py](https://app.codecov.io/gh/jgliss/pyplis/pull/40?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2lub3V0LnB5) | `53.94% <93.33%> (+22.50%)` | :arrow_up: | | [pyplis/camera\_base\_info.py](https://app.codecov.io/gh/jgliss/pyplis/pull/40?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL2NhbWVyYV9iYXNlX2luZm8ucHk=) | `69.12% <100.00%> (-0.64%)` | :arrow_down: | | [pyplis/test/test\_inout.py](https://app.codecov.io/gh/jgliss/pyplis/pull/40?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Gli%C3%9F#diff-cHlwbGlzL3Rlc3QvdGVzdF9pbm91dC5weQ==) | `100.00% <100.00%> (ø)` | |

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