Spears - migrate packages between suites

Spears is a wrapper around Britney2, which is used to migrate packages from a source to a target suite as long as they do not break installability in the target suite and fulfill other criteria, e.g. pass tests or fulfill a time limit.

TODO

About the name

The module is named after singer Britney Spears, for obvious reasons (the first result you get when you search for “Britney” on the internet).