Rough draft of widget-writing tutorial

[Owen Taylor <owt1 cornell edu>]

I've put a rough draft of a tutorial about widget writing at:
  
   http://www.msc.cornell.edu/~otaylor/gtk-gimp/tutorial/

It's quite a ways from being complete or polished, but it might be
useful to people anyways.

If you do take a look at it, a few questions:

  * Are the examples useful? interesting? too complicated?
  * Is the amount of explanation sufficient?
  * Are there other aspects of widget-writing you'd like to see covered?

Suggestions, comments, and corrections appreciated.

                                        Owen