gtksourcecompletion multipage

[perriman <chuchiperriman gmail com>]

Hi all

	I have developed a new feature: multipage completion. The completion
popup now supports insert items into different pages. You can create a
provider that insert the items into the default page or tell another
page name and the popup create the page on the fly.

I have recorded a screencast. You can see it in:
http://gtksourcecomple.sourceforge.net/multipage.ogg

If you have an idea, please, tell me!!!

Regards,
	perriman