Hard-coded order of fields in buildLocationDatabase

[wcarthur]

The database.buildLocationDatabase function assumes a fixed format for the input shape file, which is based on the stationlist.shp file that is supplied with the code.

If a user wishes to use a different location file, it must match the format of that shape file, else the function will raise an unhandled exception.

Need to have a way of mapping the attributes of the input shape file to the required attributes of tblLocations in locations.db