pv_vision.transform_crop._cell_crop.detect_vertical_lines needs debugging

[eccoope]

Was trying to run through tutorials/transform_split.ipynb and noticing a couple of issues.

1. Easy to fix - when detect_vertical_lines( ) calls split_img( ), an incorrect keyword is used (split instead of n_split) which raises an error
2. More involved fix - IndexError is raised when detectoutliers( ) is called by detect_vertical_lines( )in line 364. The error is triggered by line 125 in detectoutliers( ). Not sure what is causing this.