shell script do not assume they are called from a directory in the project home, but called from the project home while the scripts themeselves might be somewhere else

Other scripts already assumes that so it should not have much impact, it allows more possibility for the location of the scripts

 run shell linters

And stop trying to find version of odoo, it will either not work (like in most cases),
or it will be listed in the pip freeze listing

The Odoo 10 base image now merges addons, same as the Odoo 11 one.

also changed tabs to spaces