flake8 repo change as well

can now read both PAR_diag1 and ENV_diag1

- read header
- calculate Courant-Snyder (borrowed from lib_tw)

(maybe?)

to subprocess.run (e.g. stdout/stderr)

in project, fix for numbers check (failed for e.g. numpy.int64)

very basic implementation of the project.run function

need in-place install of module
for tests to work
more gitignore

improved dst.subplot further, adding kwargs and an optional normalization factor

https://confluence.esss.lu.se/pages/viewpage.action?spaceKey=HR&title=Public+Holidays+and+additional+days+off+%282022%29+Sweden

can be used by e.g. git as a difftool