stop including call stack for now

Dependencies

• [2] 5ZCQGZP5 save 2 more alternate formats for test failures
• [3] ORRSP7FV deduce test names on failures
• [4] OETGXCQM rename
• [*] 3QNOKBFM beginnings of a test harness

Change contents

• replacement in app.lua at line 468
  [2.704]→[2.704:772](∅→∅)
  − Test_errors[test_name] = debug.traceback(err_without_line_number)
  [2.704]

  [3.61188]
  + Test_errors[test_name] = err_without_line_number

  + --? Test_errors[test_name] = debug.traceback(err_without_line_number)