helper function to set the names for the fields in the input table (tableSettings).
By default it provides rbif like column names (not fully consistent yet tho).
Alternatively, the user can specify their own field names for the table
defaultTableNames <- setTableNames()
#only modifying the names for the coordinatesmyTable_withMyNames <- setTableNames (x.field='x_coord',y.field = 'y_coord')