Add red "X" to indicate invisible waypoints in routemanagerdialog
Correct wxMessageBox to OCPNMessageBox.
Extend checking and handling of malformed ENC geometry records
Correct for Mac modal message box failure.
Update HDT watchdog on synthetic HDT events.
Correctly update position fix FixTime value sent to PlugIns
Cleanup and correct one variable from long to int.
Prevent multiple cuncurrent instances of OpenCPN unless using portable (-p) option.
Correct Windows build/runtime error.