fixing bug #4393 Administration : Manque d'informations sur la création d'un domaine SQL avec espaces et/ou accents
Bug #4393 :
- modifying the treatment that computing technical domain database name (replacing each sequence of special characters by one underscore and modifying the maximum length of database table/column name from 42 to 30 (due to Oracle limitations))
- fixing the non deletion of domain property file when a domain is deleted