fix: InfixOWL fixes and cleanup (#2024)

- InfixOWL fixes and cleanup.
  [PR #2024](#2024).
  - `rdflib.extras.infixowl.Restriction.__init__` will now raise a `ValueError`
    if there is no restriction value instead of an `AssertionError`.
  - Fixed numerous issues with
    `rdflib.extras.infixowl.Restriction.restrictionKind` which was essentially
    not working at all.
  - Fixed how `rdflib.extras.infixowl.Property.__repr__` uses
    `rdflib.namespace.OWL`. 
  - Removed `rdflib.extras.infixowl.Infix.__ror__` and
    `rdflib.extras.infixowl.Infix.__or__` as they were broken.
  - Removed unused `rdflib.extras.infixowl.termDeletionDecorator`.
  - Added `rdflib.extras.infixowl.MalformedClassError` which will replace
    `rdflib.extras.infixowl.MalformedClass` (which is an exception) in the next
    major version.

Final stage of update to InfixOWL, removing unused code, tidying, adding some docu-comments, minor improvements in robustness, updating previously-failing tests, adding more tests. Expanded documentation to follow.

Co-authored-by: Iwan Aucamp <aucampia@gmail.com>

CHANGELOG.md

@@ -16,6 +16,34 @@ and will be removed for release.
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+- InfixOWL fixes and cleanup.
+  [PR #2024](https://github.com/RDFLib/rdflib/pull/2024).
+  - `rdflib.extras.infixowl.Restriction.__init__` will now raise a `ValueError`
+    if there is no restriction value instead of an `AssertionError`.
+  - Fixed numerous issues with
+    `rdflib.extras.infixowl.Restriction.restrictionKind` which was essentially
+    not working at all.
+  - Fixed how `rdflib.extras.infixowl.Property.__repr__` uses
+    `rdflib.namespace.OWL`. 
+  - Removed `rdflib.extras.infixowl.Infix.__ror__` and
+    `rdflib.extras.infixowl.Infix.__or__` as they were broken.
+  - Removed unused `rdflib.extras.infixowl.termDeletionDecorator`.
+  - Added `rdflib.extras.infixowl.MalformedClassError` which will replace
+    `rdflib.extras.infixowl.MalformedClass` (which is an exception) in the next
+    major version.
+
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 - Description of changes.
   Closed [issue #....](https://github.com/RDFLib/rdflib/issues/).
   [PR #....](https://ichard26.github.io/next-pr-number/?owner=RDFLib&name=rdflib).