fixed a bug in persistent breakpoint maintenance (handling eval'd exprs   w/o source location info)
fixed a bug in persistent breakpoint maintenance (handling eval'd exprs
  w/o source location info)

implemented right-click menu feature to print variable and return values to
  the console (useful when rendering something wider than space around buttons 
  in debug control pane)

svn: r3748

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