Flight plan filenames should reflect task number

[ivangayton]

When a user downloads a flight plan from the DroneTM, the filename is simply flight_plan.kmz (and waypoints.geojson for the GIS file). This:

• Forces the user to create separate directories on their computer to store the products for each task if they want to download more than one task before going to the field
• Makes it more likely that the user will accidentally load the wrong flight plan into the controller.

I'd recommend that we name the files something like flight_plan_289.kmz and waypoints_289.geojson, which will:

• Allow users to store multiple flight plans in a single project directory on their computer
• Help users be sure that they are uploading and renaming the correct file for a given task.