phoss SMP 5.4.0

• Added support for migrating service groups from and to another SMP - see the new menu items in the "Service group" area (see issue #78)
• An internal error on the "Business Cards" page was solved, if a Directory configuration was enabled using "https" but the certificate setup of the PD Client is broken
• Added an additional check on the "Certificate Information" page if the configured key store contains more than 1 key entry
• Added a new page that shows all the identifier mappings uses in the SMP (available in "Administration | Identifier Mappings")
• The return code of the PUT and DELETE APIs changed from 404 to 412 if the writable REST API is disabled
• Extended the REST API to create and delete ServiceGroups without SML interaction (see issue #163)
• Added a new status item smp.sql.db.connection-possible when using the SQL backend
• Added a new configuration property smp.status.sql.enabled to disable the new status item
• Added a new configuration property smp.timezone to configure the global SMP time zone (see issue #167)