function calls. Instead of copying the entire dios, we now only
store the values we actually masked and their `iloc`-position.
This has the same worst-case-costs (i.e. all values are subject
to masking) but results in significantly cheaper average costs
(i.e. only a small subset of values are subject to masking)

fixed false positive warning: "UNUSED KEYWORD: flag", for functions that dont use/need a flag (eg. SaQC.tools.copy)

Dismiss the clearance of flags between function calls

See merge request !295

Remove laziness and most of the bookkeeping machinery

See merge request rdm-software/saqc!306

seperate config reading from the SaQC class

See merge request !305

regularlize -> deregularize -> drop intermediate workflow

# Conflicts:
#   requirements.txt

# Conflicts:
#   requirements.txt

Bump matplotlib from 3.4.2 to 3.4.3

See merge request !298

Bump numpy from 1.20.3 to 1.21.2

See merge request !300

Bump pytest from 6.2.4 to 6.2.5

See merge request !302

# Conflicts:
#   requirements.txt

Bump typing-extensions from 3.10.0.0 to 3.10.0.2

See merge request !304

Bumps [typing-extensions](https://github.com/python/typing) from 3.10.0.0 to 3.10.0.2.
- [Release notes](https://github.com/python/typing/releases)
- [Commits](https://github.com/python/typing/compare/3.10.0.0...3.10.0.2)

Bumps [scipy](https://github.com/scipy/scipy) from 1.6.3 to 1.7.1.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](https://github.com/scipy/scipy/compare/v1.6.3...v1.7.1)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.4 to 6.2.5.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/6.2.4...6.2.5)

Bumps [numpy](https://github.com/numpy/numpy) from 1.20.3 to 1.21.2.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst.txt)
- [Commits](https://github.com/numpy/numpy/compare/v1.20.3...v1.21.2)

Bumps [numba](https://github.com/numba/numba) from 0.53.1 to 0.54.0.
- [Release notes](https://github.com/numba/numba/releases)
- [Commits](https://github.com/numba/numba/compare/0.53.1...0.54.0)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.4.2 to 3.4.3.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](https://github.com/matplotlib/matplotlib/compare/v3.4.2...v3.4.3)

Bumps [hypothesis](https://github.com/HypothesisWorks/hypothesis) from 6.13.10 to 6.17.4.
- [Release notes](https://github.com/HypothesisWorks/hypothesis/releases)
- [Commits](https://github.com/HypothesisWorks/hypothesis/compare/hypothesis-python-6.13.10...hypothesis-python-6.17.4)

remove History.mask to fix masking="none" issues

Closes #222

See merge request rdm-software/saqc!294

Remove the `nodata` parameter

See merge request !296