Facility to provide per-setup atom data as well as save report locally.

[kdexd]

This PR focuses on adding flexibility to current integration testing infrastructure.

Facility for Atom Data files;

• Till now only one atom data file ( generally kurucz_cd23_chianti_H_He.h5 ) could be provided using the --atomic-dataset flag. Instead of this, the integration tests can now use the atom data file specified in the YAML config of a particular setup used for integration tests (in the sub directories of tardis/tests/integration_tests ).
• The user has to put all the atom data files specified in config files of various setups in one directory and provide the directory path in integration tests YAML config file. Alternatively, these files can be served at a URL and that URL can also be provided.
• The block schema in integration tests YAML config file looks like this:

atom_data:
    fetch: "local" # has two choices: "local" or "remote"
    url: "http://urlservingfiles.com"
    dirpath: "/path/to/directory"

• If fetch is set to local, then files will be taken from dirpath and url field will be ignored. Even writing it in isn't necessary in those cases. It will be the opposite case if fetch: "remote".
• Example of URL serving atom data files: http://opensupernova.org/~karandesai96/atom_data

Local saving of report:

• The HTML report of integration tests was uploaded on a dokuwiki instance before now. This PR lets the user generate a report locally and view it in the browser.
• The block schema in integration tests YAML config file looks like this:

report:
    save_mode: "local" # has two choices: "local" or "remote"
    dokuwiki:
        url: "http://dokuwikiurl.com"
        username: "your_username"
        password: "your_password"
    dirpath: "/path/to/directory"

• If save_mode is set to local, then files will be taken from dirpath and dokuwiki section will be ignored. Even writing it in isn't necessary in those cases. It will be the opposite case if save_mode: "remote".

NOTE:

• Do add astropy's --remote-data flag as argument.

[yeganer]

Please use os.path.join instead of string formatting for the filepath.

[kdexd]

Oops, mimicked from above block 😅

[yeganer]

Thanks for this PR, it should solve the problem.

The way I imagined the fix would have been adding this functionality directly to tardis by adding an optional parameter to the config yml (url: True for example). If this is set the configuration would do the work.

But for now having this functionality exclusive to the integration tests is fine, too.