diag family number is not unique. using element number for index instead

- _dict was unused
- adding some keys in the dictionary as attributes to the class

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