Clarified test cases for #541 and #578

testdata/scad/bugs/issue541.scad

@@ -0,0 +1,7 @@
+/*
+CGAL::Polyhedron_incremental_builder_3<HDS>::
+lookup_halfedge(): input error: facet 81 shares a halfedge from vertex 61 to vertex 69 with facet 38.
+
+ERROR: CGAL NefPolyhedron->Polyhedron conversion failed.
+*/
+render() import("issue541.stl");

testdata/scad/bugs/issue578b.scad

@@ -8,4 +8,4 @@ Line       : 636
 Explanation: 
 Refer to the bug-reporting instructions at http://www.cgal.org/bug_report.html
 */
-render() import("issue78b.stl");
+render() import("issue578b.stl");

tests/CMakeLists.txt

@@ -886,6 +886,7 @@ set_test_config(Heavy opencsgtest_minkowski3-tests
 
 list(APPEND BUGS_FILES ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue541.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue578.scad
+                       ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue578b.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue582.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue584.scad)