Binding art in a hidden group or layer failed with "node N is locked",
even when nothing was locked. The error now says whether the object is
locked, is in a locked group or layer, or is in a hidden group or layer.
Make Text Dynamic and Make Visibility Dynamic reported their errors under
`variable.makeDynamic`, which is not a command id. They now name
`variable.makeTextDynamic` or `variable.makeVisibilityDynamic`.