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Documentation and code comments updated with new debugging test results

README.md

@@ -538,7 +538,10 @@ methods exit.  Unfortunately, adding commands to the end of the
 methods to close the dummy documents causes a segfault, at least under
 FreeCAD 0.16 on Scientific Linux 7.3 (and in some cases under FreeCAD
 0.16 on Fedora 28), so the methods currently leave the dummy documents
-open.
+open.  The segfault doesn't happen under FreeCAD 0.18.4 on Ubuntu
+20.04, so at some point in the future, it's likely to be safe to
+uncomment the commands in `eights.py` that will close the dummy
+documents.
 
 In setting the widths of lines in the drawing to comply with BS
 8888:2011, both the `put_it_in` method in the

eights.py

@@ -267,7 +267,10 @@ def put_it_in(self,dummy):
                 # dummy document causes a segfault, at least under
                 # FreeCAD 0.16 on Scientific Linux 7.3 and FreeCAD
                 # 0.16 on Fedora 28, so the following command is
-                # commented out.
+                # commented out.  (The segfault doesn't happen under
+                # FreeCAD 0.18.4 on Ubuntu 20.04, so at some point in
+                # the future, it's likely to be safe to uncomment the
+                # command.)
 
                 # FreeCAD.closeDocument("Dummy")
 
@@ -431,6 +434,9 @@ def fap(self,dummy):
                 # that already contains views of one shape, attempting
                 # to close the dummy document causes a segfault, at
                 # least under FreeCAD 0.16 on Scientific Linux 7.3, so
-                # the following command is commented out.
+                # the following command is commented out.  (The
+                # segfault doesn't happen under FreeCAD 0.18.4 on
+                # Ubuntu 20.04, so at some point in the future, it's
+                # likely to be safe to uncomment the command.)
 
                 # FreeCAD.closeDocument("Dummy")