Could you kindly add a “aws” option for download the source data

[gnssguo]

Dear developers，

Thanks for your excellent work for developing such a good tool for the community.

when I use the eio command, it often stops when downloading the data with curl.
when I change the curl to "aws s3 cp", the data downloading procedure works well with the same tile file and more faster.

Could you kindly add a "aws s3 cp" option for the users who has install the AWS Command Line Interface (AWS CLI).

thanks in advance

AizhiGuo@APM.AC.CN