Update www: new screenshots

Hi,

I took a look at our website. The screenshots are pretty old. I updated
all the screenshots I could. You can have a look at them here:

  http://wwwdevel.pgadmin.org/screenshots/index.php

I also updated the features page, the TODO file, the roadmap page and
probably a few other things. This is not commited right now. You'll find
a patch attached. Waiting for your comments to apply it.

BTW, may I apply the 1.12 visual tour? and keep the old one right now,
till we release 1.12.

Thanks.


--
Guillaume.
 http://www.postgresqlfr.org
 http://dalibo.com