fixing spike-normalization: getting clone name skipping 'Boldrini'; fixing fuse: don't add mrd when not in any of the fused; fixing should get tests

cypress; unify test client + server

See merge request !979

link support files of cypress client to cypress server (no duplication of code)
Don't use docker runner as we need to make 'docker in docker' for this
Add init database step before testing
Add a first testing script that login and navigate between some page of db

Also update available version of browsers
Add installation of python to be able to 'tangle' doc inside cypress image

Resolve "focus on selected clones modifie l'ordre des samples"

Closes #4783

See merge request !988