6.43 Making comments use monospaced fonts

Thanks to Alexey Popkov for this

SetOptions[EvaluationNotebook[], 
 AutoStyleOptions -> {"CommentStyle" -> {FontWeight -> Plain, 
     FontColor -> GrayLevel[0.6], ShowAutoStyles -> False, 
     ShowSyntaxStyles -> False, AutoNumberFormatting -> False, 
     FontFamily -> "Consolas"}}]