BUG: install mcutils instead of gyralcoord

.gitlab-ci.yml

 before_script:
   - apt-get update -qq
   - apt-get install python3
-  - pip install git+https://git.fmrib.ox.ac.uk/ndcn0236/gyralcoord.git
+  - pip install git+https://git.fmrib.ox.ac.uk/ndcn0236/mcutils.git
   - pip install .
   - pip install pytest