Relates to #64, #52

Refers to #36

This way an email will be sent to an admin if configured so they have a
chance to check what's going on.

Megabytes have shown to be a bit clumsy in the configuration files, so
simply switch to the more useful Gigabytes unit.

Fixes #39

Refers to #36

Refers to #3

All projects (and namespaces) should start with an "ATx" prefix, having
a capital "AT" and a lowercase "x".

Fixes #24

Currently this is almost entirely untested and configuration for email
notifications is yet to be done.

Refers to #3

Corresponds to "autotransfer-v1".