use dev branch for backend

Author: loriab

.circleci/config.yml

@@ -263,7 +263,11 @@ jobs:
                 name: Install Grid2op
                 command: |
                   source venv_test/bin/activate
-                  python -m pip install -e .[powermodels]
+                  # below (1 line) is fine when released pandamodelsbackend works w/grid2op
+                  # python -m pip install -e .[powermodels]
+                  # but when need special PdMdB repo, in this case to work with grid2op 1.11dev, use below (2 lines)
+                  python -m pip install -e .
+                  python -m pip install 'git+https://github.com/MOSSLab-MIT/PandaModelsBackend.git@dev_1.11.0' --no-deps
                   pip freeze
             - run:
                 name: Install Julia and power software