Purge data recipe now also purges shape aspect names and layers.

fixed issue adding bend between segments located at the same point

also added some tests

black format

fixes IfcOpenShell#3908: Close the opening (bim.edit_openings) while …

…having the opening selected

Update reference_structure.py

A mistype in docs: should be IfcRelReferencedInSpatialStructure instead of IfcRelContainedInSpatialStructure

root.remove_product to remove IfcRelFlowControlElements

define inherited ports attributes in bim.add_constr_type_instance

test stairs calculated params

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Update unit.py - convert function, case issue

Hi,
I noticed an issue and suggest a fix:
Unit names from <si_conversions> are all lowercase, whereas project units extracted from the IFC files with <get_project_unit(...).Name> are uppercase. So the convert function didn't seem to work properly.
Hope this helps!