Drop literature values from regions that are not in hierarchy or not in the annotation volume

[drodarie]

Fix #60. Regions dropped will be displayed with a warning. Update README.rst

[mgeplf]

Thanks! I've asked @lecriste to try this, and see if it fixes the issue. If it works, I can have a look at fixing the tests.

[codecov-commenter]

Codecov Report

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

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #61 +/- ## ======================================= Coverage ? 97.78% ======================================= Files ? 22 Lines ? 1447 Branches ? 0 ======================================= Hits ? 1415 Misses ? 32 Partials ? 0 ``` | [Flag](https://app.codecov.io/gh/BlueBrain/atlas-densities/pull/61/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | Coverage Δ | | |---|---|---| | [pytest](https://app.codecov.io/gh/BlueBrain/atlas-densities/pull/61/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | `97.78% <0.00%> (?)` | | 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=BlueBrain#carryforward-flags-in-the-pull-request-comment) to find out more.

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[drodarie]

@mgeplf I solved the tests issues. It was linked to the root region parameter. The code should be ready to review now.

[mgeplf]

Great; thanks - I'll wait to merge it until we see if it fixes the atlas issue.

[mgeplf]

Thanks @drodarie; very appreciated.