Fix require
Merge pull request #2323 from jvazquez-r7/fix_python_load

Fix require on Python bind_tcp stager
Retab should optionally keep local backups

Local backups are generally not needed since you can just git checkout
old versions anyway before committing. It was nice to have during dev
but generally shouldn't be done now.
Land #2324, make retab backups optional
Merge branch 'master' into retab/rumpus