CI: install silx requirements because before--find-links

.gitlab-ci.yml

@@ -24,7 +24,7 @@ test:
     - pip install --upgrade numpy
     # Install a version of silx containing not-released-yet features needed for Nabu
     # Hopefully this wont be needed after the 0.12 release
-    #~ - pip install six fabio>=0.7 h5py
+    - pip install six fabio>=0.7 h5py
     - pip install silx --no-index --find-links http://www.silx.org/pub/nabu/wheels/ --trusted-host www.silx.org
   script:
     - pip install git+https://gitlab.esrf.fr/tomotools/tomoscan.git