develop→master

Polish the notebook/example sections

Fix the documentation and some small issues 

Make the GRR parser a bit more robust

Fix contribution docs

Closes #490

Add loopless FBA

fix gitlab docs (attempt 3)

Polish solution for all QP problems

Reorganize the API docs to nice sections

Try to fix gitlab docbuilding deploy (attempt 2)

reflect the workflow change in contrib guide

This reverts commit 68d89398.

temporarily increase tolerance on the MOMA test (needs fixup later)