Add a user to an organization

[marien-probesys]

As technical,
I want to add a user to an organization,
so I can grant access and automatically assign its ticket to the correct organization.

Requirements / comments:

• users can be added to several organizations
• does adding a user to an organization mean the user can log in?
• we should be careful with GDPR aspects

[marien-probesys]

Checklist:

• [x] finish https://github.com/fusionSuite/FusionSuite/issues/41
• [x] develop frontend https://github.com/fusionSuite/frontend/pull/32
  • [x] add a form page to create a user (name & primary organization)
  • [x] add a table page to list existing users
  • [x] sort users
  • [x] display first and last name if any
  • [x] allow to set the user's first and last name
  • [x] pre-fill default username as "firstname-lastname"
  • [x] allow to delete a user
  • [x] update French locale
• [x] refactor code with organizations if relevant https://github.com/fusionSuite/frontend/pull/33
• [ ] allow to update users https://github.com/fusionSuite/FusionSuite/issues/63

Questions:

• how to set email and password?
• how to disallow user login?

Problems:

• items must be created by passing the type_id, it would be easier to pass a type_internalname
• properties are set by passing property_id, it would be easier to pass a property_internalname
• there are no checks on the username (no spaces? all in lowercase? unique?)
• there are no checks on first and last names (required?)