function, as dynamically assigned variables are missing otherwise

bugfix: unmasking reinjected the new (i.e. nan) instead of the old values (this should have been caught by a test)

Bump numpy from 1.19.1 to 1.19.2

See merge request !98

Bumps [numpy](https://github.com/numpy/numpy) from 1.19.1 to 1.19.2.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/master/doc/HOWTO_RELEASE.rst.txt)
- [Commits](https://github.com/numpy/numpy/compare/v1.19.1...v1.19.2)

Bump pandas from 1.1.1 to 1.1.2

See merge request !97

Bumps [pandas](https://github.com/pandas-dev/pandas) from 1.1.1 to 1.1.2.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Changelog](https://github.com/pandas-dev/pandas/blob/master/RELEASE.md)
- [Commits](https://github.com/pandas-dev/pandas/compare/v1.1.1...v1.1.2)

Bump attrs from 20.1.0 to 20.2.0

See merge request !95

Bump numba from 0.51.1 to 0.51.2

See merge request !94

        failed, as they were evaluated during 'compile' time instead
        of execution time

Bump attrs from 19.3.0 to 20.1.0

See merge request !86

Bump regex from 2020.6.8 to 2020.7.14

See merge request !90

Bump more-itertools from 8.4.0 to 8.5.0

See merge request !92

fixed flagger issues with copiing. this also solves the "harmo eats comments"-bug, where the problem arised from a shallow copy by flagger.getFlags().

Bump llvmlite from 0.31.0 to 0.34.0

See merge request !80