Issue 24 and 16 fixed

[joelpires]

• the minor Issue 24 is fixed.
• Small detail on getting_started_md corrected.
• issue 16 solved (add a custom editor):
  - a special key in the database (user_id.db) holds the custom editor of the user
  - every time a user specifies an editor when opens a notebook, the custom editor is updated so that in the next time the user can run notebooks without specifying it.
  - when uninstalling/installing the new version, it is crucial to delete the SQLite databases (located in Appdata ->Roaming -> praxxis), otherwise, the database user_id.db won't have the new (key, values).

[msftclas]

All CLA requirements met.

[abertsch72]

Confirmed 24 is fixed, thank you!

Your code for 16 works, but I don't think it's necessarily the best behavior. The original intent for 16 was to be able to select a editor for opening in the command line -- for instance, preferring nano or emacs over vim. I could see setting html or jupyter as a default being useful if that's your usual mode of operation, but since the no-args open is the command line open now, you lose the ability to open a notebook in the command line if every open rewrites that default. Maybe we should set the default command line view every time it's specified (e.g. "prax o 1 nano" rewrites the default for "prax o 1") but not change the default if we're opening in jupyter or html or ads? Or otherwise, we could keep this default-setting behavior but add arguments for command-line view. Which do you think would fit your use better?

[joelpires]

You're right. I made a new commit with new commands "prax ce" and "prax ve" that are explained in the image above (excerpt from the new "getting_started.md").
Errors for trying to change to an ordinal or a name of an editor that is not available are also managed.