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

Now when running distclean ALL files generated by the ./bootstrap && ./configure && make are deleted.
Maybe it's not a good idea because it's not the purpose of distclean target...

IMPORTANT : tests are broken. See details below

A new lodel/buildconf.py.ini file created. It will be transformed to a lodel/buildconf.py file by ./configure .
This file goal is to store build time constant (for the moment the presence of pymongo).
You have to build lodel2 before being able to run the tests.

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

Now a backreference is represented by a tuple(LeObject child class, fieldname)

Adding images support for doxygen documentation ( in doc/img ) + automated images generation with graphviz & make