Introduce new ports:

• cfengine39 (3.9.0), copied from cfengine38
• cfengine-masterfiles39 (3.9.0), copied from cfengine-masterfiles38
• add cfengine39 to cfengine metaport (non-default for now)
• add cfengine-masterfiles39 to cfengine-metafiles metaport (not default for now)

Sort documentation files in cfengine39.