new features

Add the traj module for handling trajectory data. This module includes the following functionalities:

traj_mapmatch(traj, G[, col])
Nearest map matching: Find the nearest point on the road network for each trajectory point.
traj_clean_drift(data[, col, method, ...])
Delete the drift in the trajectory data.
traj_clean_redundant(data[, col])
Delete the data with the same information as the data before and after to reduce the amount of data.
traj_slice(traj_data, slice_data[, ...])
Slice the trajectory data according to the slice data.
traj_smooth(data[, col, proj, ...])
Smooth Trajectory Using Kalman Filter.
traj_segment(data[, groupby_col, retain_col])
Segment the trajectory in order and return the starting and ending information of each segment.
traj_densify(data[, col, timegap])
Trajectory densification, ensure that there is a trajectory point each timegap seconds
traj_sparsify(data[, col, timegap, method])
Trajectory sparsify.
traj_stay_move(data, params[, col, activitytime])
Input trajectory data and gridding parameters, identify stay and move
points_to_traj(traj_points[, col, timecol])
Input trajectory, generate GeoDataFrame

fix bugs