Fix #3974. Bug where orphaned histories would be left in API remove operations.

src/ifcopenshell-python/ifcopenshell/api/structural/remove_structural_load_case.py

@@ -16,7 +16,9 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
+import ifcopenshell
 import ifcopenshell.api
+import ifcopenshell.util.element
 
 
 class Usecase:
@@ -34,5 +36,10 @@ class Usecase:
     def execute(self):
         # TODO: do a deep purge
         for rel in self.settings["load_case"].IsGroupedBy or []:
+            history = rel.OwnerHistory
             self.file.remove(rel)
+            if history:
+                ifcopenshell.util.element.remove_deep2(self.file, history)
+        history = self.settings["load_case"].OwnerHistory
         self.file.remove(self.settings["load_case"])
+        ifcopenshell.util.element.remove_deep2(self.file, history)