Do not add default options to notebook metadata?

[grst]

When I create a new blank notebook,
the following default metadata are added to the notebook

nbrmd_formats": [
    ".ipynb",
    ".Rmd",
    ".py"
  ],
  "nbrmd_sourceonly_format": ".Rmd",

There are two issues with that

1. They do not correspond to my default options. My jupyter config just contains these two lines:

c.NotebookApp.contents_manager_class = 'nbrmd.RmdFileContentsManager'
c.ContentsManager.default_nbrmd_formats = ['.ipynb', '.Rmd']

2. I believe that these options should not be added to the metadata automatically in the first place.

• If I set a certain default behaviour in the jupyter config, and, at some point decided to change that behaviour, I would have to edit the metadata of all notebooks manually.
• Also, when working on a shared project, one of the collaborators might want to have a separate .ipynb file, and the other only .Rmd.
• If a user wants a different behaviour only for a single notebook, he is free to add the options to the metadata manually.

[mwouts]

Well, I think I can only agree! Thanks Gregor for your feedback. I'll fix this quickly.