Rudder

We want to get rid of ncf/python api and make technique editor only based on Rudder api

This will allow to have more strict checks on the format of techniques

This will also allow to commit in one go all files relative to a change, contrary to how it is currently done with ncf-hooks (like a commit for each file)

We will also move the technique file to the techniques folder (techniques/ncf_techniques/technique_name/technique_version/technique.cf instead of ncf/50_techniques/technique_name/technique_name.cf)