Update unit tests not to use editable installs

Author: timvink

.github/workflows/unittests.yml

@@ -25,7 +25,7 @@ jobs:
         pip3 install --upgrade wheel
         pip3 install pyflakes
         pip3 install -r tests/test_requirements.txt
-        pip3 install -e .
+        pip3 install .
 
     - name: Static code checking with pyflakes
       run: |

.github/workflows/unittests_codecov.yml

@@ -33,7 +33,7 @@ jobs:
         pip3 install --upgrade wheel
         pip3 install pyflakes
         pip3 install -r tests/test_requirements.txt
-        pip3 install -e .
+        pip3 install .
 
     - name: Static code checking with pyflakes
       run: |
@@ -52,4 +52,4 @@ jobs:
         token: ${{ secrets.CODECOV_TOKEN }}
         file: ./coverage.xml
         flags: unittests
-        fail_ci_if_error: false
+        fail_ci_if_error: false