Include more files into the package

[codecov[bot]]

Codecov Report

Base: 87.73% // Head: 87.94% // Increases project coverage by +0.21% :tada:

Coverage data is based on head (90aa792) compared to base (fdcae84). Patch coverage: 70.27% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #331 +/- ## ========================================== + Coverage 87.73% 87.94% +0.21% ========================================== Files 69 69 Lines 10403 10328 -75 ========================================== - Hits 9127 9083 -44 + Misses 1276 1245 -31 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `87.94% <70.27%> (+0.21%)` | :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=zwicker-group#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/zwicker-group/py-pde/pull/331?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group) | Coverage Δ | | |---|---|---| | [pde/fields/tensorial.py](https://codecov.io/gh/zwicker-group/py-pde/pull/331/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL2ZpZWxkcy90ZW5zb3JpYWwucHk=) | `83.15% <43.75%> (+1.05%)` | :arrow_up: | | [pde/fields/vectorial.py](https://codecov.io/gh/zwicker-group/py-pde/pull/331/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL2ZpZWxkcy92ZWN0b3JpYWwucHk=) | `83.40% <60.86%> (+5.34%)` | :arrow_up: | | [pde/tools/mpi.py](https://codecov.io/gh/zwicker-group/py-pde/pull/331/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL3Rvb2xzL21waS5weQ==) | `68.11% <71.42%> (-14.43%)` | :arrow_down: | | [pde/grids/boundaries/local.py](https://codecov.io/gh/zwicker-group/py-pde/pull/331/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL2dyaWRzL2JvdW5kYXJpZXMvbG9jYWwucHk=) | `84.04% <72.72%> (-0.69%)` | :arrow_down: | | [pde/tools/numba.py](https://codecov.io/gh/zwicker-group/py-pde/pull/331/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL3Rvb2xzL251bWJhLnB5) | `70.89% <76.92%> (+15.07%)` | :arrow_up: | | [pde/grids/base.py](https://codecov.io/gh/zwicker-group/py-pde/pull/331/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL2dyaWRzL2Jhc2UucHk=) | `86.15% <94.44%> (-3.16%)` | :arrow_down: | | [pde/tools/expressions.py](https://codecov.io/gh/zwicker-group/py-pde/pull/331/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group#diff-cGRlL3Rvb2xzL2V4cHJlc3Npb25zLnB5) | `94.10% <100.00%> (+0.18%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zwicker-group)

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