netcdf support - Githubissues

As discussed in the call today:

[x] enable netcdf in the tester (adjust docker images)
[ ] add it to the installation instructions / candi.cfg / check that the ubuntu package works
[ ] make it a required dependency (yes?)
[x] allow it to be used in all ascii data plugins
[x] add a test prm that uses it
[ ] consider renaming ascii data to structured data in the parameter names for 3.0
[ ] decide if everybody, once per node, or rank 0 needs to load the file
[ ] is this stored once per node?

geodynamics / aspect