As discussed on conpherence :

• add an user field that is optional
• verify that the user is not root
• update the default config with en empty field, so we have an int that user field exists
• if the user field exist in configuration and is not null : add a sudo into the command
• update diviner documentation
• correct the wording evrywhere so it sound english

I plan wording correction and test a little bit more edge cases.
But nothing that will really change the code structure so you can start reviewing
that if you got some times.

I hope that this contribution, on the contrary to previous ones, will match all the requirements.

• I first removed ws from my mac so the command failed and thus so I can see the actuall command than run.
• what was tested :
  • with empty user in config, it don't sudo
  • with no user in config, it don't sudo either
  • with 'blabla' user in config, it sudo and fail cause blabla is not an user