After we merge a rebase, we need to sync with the repositories and then
autosquash the new branches.
I used to do it manually, but it takes some time, so I decided to
implement this functionality in the script.

Maybe in the future I could change it to create the branch if it does
not exist, instead of trying to reset it.

This functionality does not try to rebase the re-created branches, so
you will have to re-run the script if you need to.

Also added a script to generate a state file.