Standardize input processing in TripExtractor #32
Description
TripExtractor() creates a TrajectoryCollection with min_length and min_duration when receiving a GeoDataFrame as input. However, when the input is already a TrajectoryCollection or a Dataset, then the min_length and min_duration parameters go unnoticed. This should be unified, so that a TrajectoryCollection or Dataset input is processed in the same way as a GeoDataFrame or at least a user warning should be displayed.
