Read folders in separate goroutines.
Read folders in separate goroutines.

As proposed in the FIXME, read folders in parallel.
This appears to fix "Next token is expired" on very big directories.
The only downside is that this doesn't abort at once if an error is found.
I added some logging, so there is some output for "-v".

jackschmidt/rclone,kynikos/rclone,Blackfin/rclone,ncw/rclone,ncw/rclone,jackschmidt/rclone,simlelievre/rclone,yonjah/rclone,olihey/rclone,klauspost/rclone,simlelievre/rclone,alexcouper/rclone,seuffert/rclone,simlelievre/rclone,jackschmidt/rclone,B4dM4n/rclone,klauspost/rclone,yonjah/rclone,arcimboldo/rclone,greendayo7/rclone,greendayo7/rclone,Blackfin/rclone,arcimboldo/rclone,kynikos/rclone,greendayo7/rclone,ncw/rclone,olihey/rclone,kynikos/rclone,seuffert/rclone,olihey/rclone,alexcouper/rclone,greendayo7/rclone,olihey/rclone,B4dM4n/rclone,arcimboldo/rclone,arcimboldo/rclone,seuffert/rclone,seuffert/rclone,klauspost/rclone,kynikos/rclone,ncw/rclone,jackschmidt/rclone,B4dM4n/rclone,yonjah/rclone,yonjah/rclone,Blackfin/rclone,B4dM4n/rclone,alexcouper/rclone