[Galene] Galene API merged into master

[Juliusz Chroboczek <jch@irif.fr>]

Hi,

I've just merged the "api" branch into master.  If you choose to upgrade,
please check your log file for warnings, they may indicate that you are
using features of the old group file format that cannot be converted to
the new format.


In order to use the API:

0. Upgrade to current master.


1. Set a "users" and "writableGroups"

    "users": {"root": {"permissions": "admin", "password": ...}},
    "writableGroups": true

The value of the password field can be either a plain-text password, or
a hashed password entry as generated by "galene-password-generator".


2. Log into a group with password authentication (not with a token), open
the side menu, choose "change password", and notice that you can now
change your password without editing any JSON files.


3. Say:

    curl -i -u root -X PUT -d '{}' -H 'Content-Type: application/json' -H 'If-None-Match: *' https://galene.org:8443/galene-api/0/.groups/test/
    curl -i -u root -X PUT -d '{"permissions":"present"}' -H 'Content-Type: application/json' -H 'If-None-Match: *' https://galene.example.org:8443/galene-api/0/.groups/test/.users/jch
    curl -i -u root -X POST -d 'topsecret' -H 'Content-Type: text/plain' https://galene.example.org:8443/galene-api/0/.groups/test/.users/jch/.password
    

Next steps:

1. Write a simple management UI, just enough to create groups and users.

2. Add token management to the API.

-- Juliusz