Feature #907 : publishing a suggestion
Feature #907 :
- registering the approbation date when suggestion is published directly by a publisher or a user that has a greater role
- list suggestions which the status is pending validation
- list published suggestions
Feature #907 : code formatting and adding a new suggestion table column.
Feature #907 : wiring the common classes added in order to handle validation of contributions.
Feature #907 : validating or refusing a validation.
Feature #907 : validating or refusing a validation.
(fixing some unit tests -> yes, it was a forgetfulness)
feature #907 sprint3 :   Fix some bugs discovered during the validation and mainly on the case of characters in the reference of bundles in the filesystem