Changes

In the pipeline of releasing a version of Silverpeas, split each stage
of release in two: one for the releasing itself and another one for
preparing the dev iteration for the next version of the project.

Improve the pipeline of publishing the community web site by taking into
account the release of a new version of Silverpeas.

The pipeline of publishing the documentation of Silverpeas-Core,
Silverpeas-Components and the community web site for a new version of
Silverpeas is now in declarative syntax and has been improved to take
into account existing Jenkins job (for delegating some of its stages)

The pipeline of releasing a new version of Silverpeas takes care now of
the expectations of the pipeline of publishing Silverpeas projects'
documentation.

Refine some properties about the wildfly version