GtkCellLayout interface

[Kevin Ryde <user42 zip com au>]

Is GtkCellLayout available as an interface thingie for perl code widgets
to implement?  Or is it needed?  I guess you could just write the
corresponding method funcs if you like its style and that'd be close
enough for use from other perl code.

(I'm tinkering with a scrolling stock ticker and thought CellLayout
might be the most familiar way to stick in a renderer -- if not
necessarily the simplest.)