fix GUI builder due to `pasteboard%' change way back  - the `insert' method of `pasteboard%' was always    documented as inserting to the back by default, but the    old C++ implementation actually inserted at the front for    one of the overloadings; keeping the releatively new    behavior supports more recent code at the expense of old    code, and this commit is for old code
fix GUI builder due to `pasteboard%' change way back
 - the `insert' method of `pasteboard%' was always
   documented as inserting to the back by default, but the
   old C++ implementation actually inserted at the front for
   one of the overloadings; keeping the releatively new
   behavior supports more recent code at the expense of old
   code, and this commit is for old code

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket