Filter warnings (#213)

* filter warnings, "error" initially

* filter warnings "default"

Author: stephenworsley

pyproject.toml

@@ -115,6 +115,7 @@ testpaths = [
   "tephi/",
 ]
 doctest_optionflags = "NORMALIZE_WHITESPACE ELLIPSIS NUMBER"
+filterwarnings = ["default"]
 
 [tool.repo-review]
 # These are a list of the currently failing tests:
@@ -124,11 +125,6 @@ ignore = [
 
     # https://learn.scientific-python.org/development/guides/packaging-simple/#PY005
     "PY005",  # Has tests folder
-
-    # TODO: exceptions that still need investigating are below. Might be fixable, or might become permanent (above):
-
-    # https://learn.scientific-python.org/development/guides/pytest#PP309
-    "PP309", # has filterwarnings set
 ]
 
 [tool.ruff]