We make the full name mandatory and add a field to
allow user to store personnal notes on the contact.
This also make the "base" contact not mandatory because
user may want to create new contacts out of the blue.
To improve readability and code sharing we group all
APIs into the same "api" module for each application.
Next submodules might be "scim",
"resource_server_scim", ...
The only shared module is the "permissions" one for now.
