Trac #34945: Refactoring tool to fix modularization anti-patterns
The new command `sage --fiximports` replaces imports from
`sage.PAC.KAGE.all` by more specific imports when `sage.PAC.KAGE` is an
implicit namespace package.
Part of Meta-ticket #34201
URL: https://trac.sagemath.org/34945
Reported by: mkoeppe
Ticket author(s): Alex Chandler, Matthias Koeppe
Reviewer(s): Matthias Koeppe, Alex Chandler
