See if we can get MS Windows working

.github/workflows/windows.yml

@@ -23,12 +23,12 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -e .
-    - name: Install Mathics_Scanner
+    - name: Install Mathics Scanner
       run: |
-        python setup.py install
-    - name: Test Mathics
+        pip install -e .
+    - name: Test Mathics3
       run: |
-        pip install -r requirements-dev.txt
-        pip install -r requirements-full.txt
+        # Is the next line needed?
         python mathics_scanner/generate/build_tables.py
+        pip install -e .[dev,full]
         py.test test