Smart Restores and more!

This release brings smart restore options! Now you can restore to snapshots more easily than having to do a series of manual restore requests.

Other enhancements:

• Moved to multipart uploads for AWS S3
• Added test coverage for backends to test for correctness
• Added lock files to ensure that a dataset is only being operated on by a single instance of this application (e.g. if this is run in a cronjob and a backup procedure is taking longer than the next scheduled execution of the cronjob, it will block execution)
• Cleans up error handling throughout and removed all explicit panics
• Some refactoring and fixed a few bugs
• Proper removal of temp directories