scm: set supporting directory revisions or not at scm level.
scm: set supporting all revisions or not at scm level.
Adds a visible scope to the Journal model.
Adds Issue#visible_condition to build issue visibility statement.
Changed the way the visibility SQL statement is built.
scm: recovery showing "root @ branch" in repository tree viewing.
scm: code clean up repositories/show.rhtml.
scm: git: prevent showing trace when repository path changed.
Use names instead of ids for wiki anchors (#6905).
