do-many-buffer-evals

This function should evaluate all of the expressions in a buffer.

• (send a-drscheme:rep:edit do-many-buffer-evals edit start end pre post) -> void
      edit : a wx:media-edit% object
      start : int
      end : int
      pre : a function of no arguments
      post : a function of no arguments

  It evaluates all of the expressions in edit starting at start and ending at end.