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

src/ifcopenshell-python/ifcopenshell/api/void/remove_filling.py

@@ -16,6 +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.util.element
+
 
 class Usecase:
     def __init__(self, file, element=None):
@@ -56,5 +59,8 @@ class Usecase:
     def execute(self):
         for rel in self.file.by_type("IfcRelFillsElement"):
             if rel.RelatedBuildingElement == self.settings["element"]:
+                history = rel.OwnerHistory
                 self.file.remove(rel)
+                if history:
+                    ifcopenshell.util.element.remove_deep2(self.file, history)
                 break