Merge branch issue#129 with master
Huge update for the new migration workflow:
- New name : switch_space_id.
- The given space id is checked in application.properties.
- Most of the treatments have been moved to a "components" folder, allowing us to create easily a new "migrate_several_projects" (or "bulk_project_migration") later.
- The workflow can be launched from the single project view on the nG6 website, when logged a superadmin user.
- The project's space_id is visible to everyone on the single project view.
- A warning indicating that the migration updates the retention has been added to the workflow's form in single project view.
- More logs in ng6.log, and the new log file MoveProject.stdout. (path exemple : [...]/jflow/work/switchspaceid/wf000452/MoveProject_default/MoveProject.stdout)
- CSS updates for the project views.
- For new space_ids, the <space_id>/run and <space_id>/analyze directories will be created if missing.