- Adds 2 'connection' attributes 'self.cnx' & 'self.cursor'
- Adds some tests
- TODO : Find how to test if connection is broken
- Renames 'cnx()' method to 'start_connexion()'
To lighten and improve the __init__
Now it can be re-called after the create-DB script
Exports messages template in 'config.py'
PyMysql seem not to accept 'CREATE TABLE IF NOT EXIST'