Call SetLocation to set top Assembly Location

[lorenzncode]

Fixes #1594.
Alternative fix of1594.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.92%. Comparing base (9ee703d) to head (01a303e).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1623   +/-   ##
=======================================
  Coverage   94.91%   94.92%           
=======================================
  Files          28       28           
  Lines        6259     6263    +4     
  Branches     1271     1271           
=======================================
+ Hits         5941     5945    +4     
  Misses        192      192           
  Partials      126      126           

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[lorenzncode]

This seems more straightforward - prefer this over #1595 use of location multiplication?

This PR creates an additional label. The display of the tree view of an exported step in OCCT CAD Assistant or FreeCAD shows this as an additional tree item. Just to mention the representation is slightly different but I think this is expected OCCT behavior.

[adam-urbanczyk]

This looks cleaner, thanks @lorenzncode ! I moved the code back into _toCAF`.

[jmwright]

Looks good. Thanks @lorenzncode !