Bufixes in start & stop functions
Add a -f --foreground option allowing to run an instance in foreground
There is one problem left : the unix socket creation is not done in the instance directory...

Using execl instead of fork to preserv the pid

Bugfixe in start
implements stop
add info in instance details

On configuration setter

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

Deleted the json "db" of slim.py : progs/instances.json
Add features to SLIM :
- interface configuration editing from CLI
- better listing

solves #145

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

Now slim is able to create an instance, run make all, and start an interactive python without errors
refs #145

- 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

Allows runtest to run again =)

Able to :
- create/delete instances
- list instances
- run make %target% in all instances
- edit configuration given an instance name

refs #145

Nescessary for refs #145

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

refs #132

solves #58

The file is the pyconfoigure m4 macros patch that solves tyhe python3 bug and add macro to check a module version number ( refs #140 )

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