Calculate and display normals

added Doing label

mentioned in merge request !76 (merged)

mentioned in commit 224c9aca

mentioned in commit 368c1b7a

added To Do label and removed Doing label

added Doing label and removed To Do label

mentioned in merge request !115 (merged)

closed via merge request !115 (merged)

mentioned in commit 76f6202b

mentioned in commit f9e26959