recounted

Called by a snip to notify the administrator that the specified snip has changed its count. The snip generally needs to be updated after changing its count, but the snip decides whether the update should occur immediately.

• (send a-snip-admin recounted snip refresh?) -> void
      snip : snip% object
      refresh? : boolean

  If refresh? is not #f, then the snip is requesting to be updated immediately. Otherwise, needs-updatemust eventually be called as well.