Consider disabling coverage for testing

[geryxyz]

Right now, the coverage measurement is enabled for pytest-based testing. I fail to find any current usage of this information during the development process. However, I may miss something. By my experiment, this option makes it impossible to use any breakpoint in VSCode during test debugging. See this issue microsoft/vscode-python#693
A workaround to disable the coverage in the developers local VSCode config like so:

Please consider disabling this feature at the project level if it is not used for anything.

[copernico]

Indeed I have the --no-cov in my settings.json :-)
I use the coverage reports to monitor the situation from time to time. How could we do that in a better way?
I'm open to alternative solutions.

[copernico]

Please add this issue to the developer guidelines (see #208 )