Is there a way to use Pango Markup in GtkTextBuffer

[Douglas Vechinski <douglas vechinski dynetics com>]

Is there any convenient way to insert text using the Pango Markup
language into a GtkTextBuffer.  Such functions exist for GtkLabel and
GtkCellView but I haven't seen any for GtkTextBuffer.  If none exist, is
there a reason they don't?  Seems like such functions would aid in
inserting text with attributes into a buffer easier than using and
defining all the necessary tags.