Stop sync on the TravelHistoryControl EDSMSync
Stop sync on the TravelHistoryControl EDSMSync

EDDiscoveryForm._edsmSync is not used.  Remove it, and
stop the sync on travelHistoryControl1.sync instead.

jeoffman/EDDiscovery,vendolis/EDDiscovery,jthorpe4/EDDiscovery,mwerle/EDDiscovery,jeoffman/EDDiscovery,jgoode/EDDiscovery,jgoode/EDDiscovery,vendolis/EDDiscovery,mwerle/EDDiscovery