Changes

For the generation of an izpack distribution of Silverpeas, remove the computation of the next version
Fix syntax in the Jenkinsfile to generate a docker image for jobs in
Jenkins and for dev.
Fix bug syntax in the Jenkinsfile to generate a Docker image of
Silverpeas and to open a PR in the DockerHub github to integrate this
image in the Docker official repositories.

Update the mapping between Silverpeas branches and Docker image version to build it

During the generation of the web site of the Silverpeas community, when
getting the Wildfly version from the release report of a stable version
of Silverpeas, remove the '.Final' word from it.

Update the build version of Silverpeas to 6.4-build221012

Fix the current wildfly version property. Update the installation guide of Silverpeas 6

Update the copyrights in the files with the URL schema modified to https

Update the version of Wildfly for both stable and in-dev version