- updated scripts etc
- make tests pass

Theorically all of those imports were tested by unit testing, but we've got no inssurance about that.
And even if unit tests had check for syntax errors, all pieces of code were not tested. We cannot
be sure that an import was missed or forgotten...

using --plugin option instead of uwsgi_python3 shortcut (can be uwsgi_python34 etc)

Adds a LODEL2LOGDIR to buildconf.py
Adds a nginx-conf option to slim
...

Now create an INSTANCE_NAME.sock in @localstatedir@/uwsgi_sockets
Note : the localstatedir is wrong -_- /usr/var instead of /var........

Using execl instead of fork to preserv the pid

SLIM is now able to edit configuration from CLI, to start instances etc.

- webui now calls a hook to indicate a session end
- loader.py now set a lodel.dyncode module exposing dynmically generated code

- creating a function in webui/main.py root_url() that returns the root url without trailing /
- use this function in router and template/loader

To start in standalone uwsgi set lodel2.webui.standalone=True in conf file and start loader.py

- create_instance.sh create some symbolic links
- webui plugin that add webui configuration variable