When not found return None and do not try to run len() on None

Return an instance and not a list of len 1 anymore

In construct and check data

with make deb . Next commit will update the README

Before when session restore fails the webui was answering "Unknown status 200" as content.
Now it produce 2 log messages (maybe)

broken nginx conf + absolute path in slim that is known only at build time

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

It a real buildtime variable, the localestatedir

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

when a value is composed only with space tabs etc consider it as None

- Written a new custom_list validator, it takes another validator name as argument (in order to validate items of list)
- Using it to validate list of plugins names

Implements the check of the bases classes of a datasource class in a datasource plugin ( solves #144 )

refs #132

Now backref seems to work at creation of a Person linked with a text the Person UID is appended to Text.linked_persons

Triggered a bug in wrong Integer DH tests

Return the value of this datahandler when empty

refs #131

The dedup mechanism was using a cast of list to set. But sometimes, filters contains list, and list are not hashable...

refs #131

Methods are written.
They are not called by anyone and the only tests that were done is that no syntax error is raised.
( refs #131 )

- deletion of unused attributes
- copy the back_reference checks in _set_back_reference function and use it in Reference.__init__()