Slim down PR checklist

.github/pull_request_template.md

@@ -6,17 +6,8 @@
 
 I confirm that I have completed the following checks:
 
-**Testing**
-- [ ] If I have changed any of the Python or Fortran code, I have rebuilt and run the tests locally and they have passed.
-- [ ] I have addressed any differences in the regression tests caused by this pull request in the comments.
+- [ ] I have justified any large differences in the regression tests caused by this pull request in the comments.
 - [ ] I have added new tests where appropriate for the changes I have made.
 - [ ] If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
-
-**Quality**
-- [ ] I have ensured my changes are formatted correctly and conform to PROCESS' quality standards.
 - [ ] If I have made documentation changes, I have checked they render correctly.
-
-**Miscellaneous**
-- [ ] I have created a changelog entry for my change, if appropriate.
 - [ ] I have added documentation for my change, if appropriate.
-- [ ] **I confirm my contribution is made to PROCESS under an MIT license**.