Bugs in process_result.py and process_result_old.py

[oranfire]

Thanks for your excellent works in the RGB-D VIO and the public dataset! I benefit a lot from your code and the VCU-RVI dataset...

There may be some mistakes in the evaluation code. To discard manually selected intervals for VIO initialization, line 99 in the process_result_old.py and process_result.py should be: 'start_idx = find_nearest(data[:,0])', instead of 'start_idx = find_nearest(data[0,:])'.