Upgrade web2py to use new S3 module

[smorrison]

Replace the S3 access lib in web2py (./modules/data_storages.py) with new library.

• change project so that the S3 access module is imported via requirements.txt and import statements.
• change references in code to use new/changed api.
• change "classic" uploader to not upload duplicate info OR make lib so that it recognizes/ignores duplicate data.
• change web2py download and bundle listing as required.