this makes the PPI name reproducible regardless of order
in the form data
WIP on #194

fixes #182

handle undefined PPI family name

to enable displaying it as icons in the admin interface

and add unit tests for it

bug introduced in 0ab38431 and
visible here: https://gitlab.pasteur.fr/ippidb/ippidb-web/-/jobs/46382
WIP on #68

compounds are visible only if validated or if the user is the creator
or an admin.
WIP on #67

this is to FIX #168

FIX #166

(commit 7143e9d0 on #139)

fix #149

basically, this adds:
- a CI step to run flake8, _including_ the black plugin to check
  whether or not files need black reformatting
- add flake8 and black to dependencies
- reformat files and correct style so that current code passes

fix #139
WIP on #134

Fixing duplication in disease filter, preventing regression on ProteinDomainBoundComplex filter and ProteinDomainPartnerComplex filter

this includes the corresponding test in the contribution tests
module
WIP on #68

WIP on #110

fix #109

WIP #68

fix #74

e.g. lipinsky_score depends on the other lipinsky "submetrics" then
lipinsky is computed from lipinsky_score

warning: now these properties need to be updated with the new
admin command `cache_compound_properties`

fix #60