ExampleContactListManager: allow tags to be created without signalling
ExampleContactListManager: allow tags to be created without signalling

Then, use this to coalesce the result of create_groups() into a single
signal.

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib