Removed 'visualiseInstance' 'singleton'.
Removed snapshot code from front-end.
ActiveGeoNetworkRecordStore is now initialised with a LayerStore instance (which is also used to initialise the MapPanel).
Moved geoserver/FTL global callback to ActiveGeoNetworkRecordStore, since it seems to fit there better now.
Merge pull request #677 from aodn/remove_snapshot_and_no_layer_store_singleton

Remove snapshot and no layer store singleton