Merge tag 'sparks-1.13.7' into develop

1.13.7
Fixes for remote Django settings load, warning if not found, and cleanup for local environment variables after local Django settings load.
SPARKS_VERBOSE=True setups basic logging.
get the django settings from local if local. Probably not needed because remote_configuration should have local data inside, but worth testing just to validate.
The same idea, but take into account the djsettings lazy loading feature.
Idem (lazy-loading…) in foundations.
better error information and use env.root if available.
Avoid recursion on Django load error.
remove duplicate information and sanitize variable names.
mini-fix.
bump version in setup.py
Merge branch 'release/1.13.8'