Build fixes

1. Update files of the build system (including the license headers).
2. Set standard-conformant edit descriptors (the standard requires explicit spacing for X values).
3. Resolve NetCDF API mismatches (a number of NetCDF functions expect arrays instead of scalars).
4. Add missing PUBLIC statements in the module files.

Overall, it makes it possible to build the model with the same picky compilers and compiler flags that we use in ICON.

Dear Stefan, could you, please, take a look? I can split this into four separate merge requests if you like.

Dear Sergey, I will take a look. Best regards Stefan

mentioned in commit 823990f9

merged