png debug output

[Brian Kurotsuchi <bkurotsu toocool itslab calpoly edu>]

I'm getting a lot of debugging output, but I can't figure out where its from.
When I start up panel, it spits this stuff out.  The display program from
ImageMagik also does it when I view a PNG image file.  Does anybody know what
package produces this?  Is it libpng or Imagemagik?

        in png_combine_row
        in png_read_finish_row
        in png_read_row (row 15, pass 0)
        in png_read_filter_row
                row = 15, filter = 4
        in png_combine_row
        in png_read_finish_row
        in png_read_row (row 16, pass 0)
        in png_read_filter_row
                row = 16, filter = 4
        in png_combine_row

BK