Improve FLOP counting function

Since 'sp.UnevaluatedExpr' and 'DivFunc' are fundamental now for pystencils it is also important to introduce those functions in the FLOP counting

.gitlab-ci.yml

@@ -29,6 +29,9 @@ tests-and-coverage:
     - AVX
   artifacts:
     when: always
+    paths:
+      - coverage_report
+      - test-report
     reports:
       coverage_report:
         coverage_format: cobertura