gobject API docs and tutorial merge : stage 1

[Stefan Kost <ensonic hora-obscura de>]

hi,

I've not stated with the document merge. The current result is available at:
http://www.buzztard.org/apidocs/gobject/

I currently think about how to best merge the duplicate info from Introduction 
and Concepts/Introduction.

Next thing is to add links from concepts and tutorial text to API docs.

Would be nice if you can try and comment, if it generally looks good (the order 
of information, document structure).

Ciao
  Stefan