patch [#598052] by derjochenmeyer
patch [#588258] by dboulet
patch [#590264] by dboulet
bug [#571928] by igorik
fixed some CSS styling issues

[bug] [#538594]
[bug] [#545996]: IE6 compatibility
[bug] [#570656]
[bug] [#546228]
And fixed some CSS styling to the messages.

[feature request] #[533438] by himerus: Added an option to disable auto close if there was an error message.
[feature request] #[536474] by budda: Added ESCape key close.
[bug] #[536732] by budda: Added some style to fix small messages style.

[bug] #[533490] by [bstorm]: Added processed class to the JavaScript file, that way the message won't pop up for every Drupal.attachBehaviors on ajax request!

support request #527594 by greylogic: Now better_messages works with any module or theme that calls theme('status_messages'). That fixes getting AHAH messages with neat coding. And it still gracefully degrades.

support request #528548 by kyutums: Added page visibility settings. Now you can specify to activate Better Messages only at certain pages. This means that if Better Messages are not active at pages 'admin/*', you will keep seeing the default Drupal messages!
- Now Better Messages CSS and JS files are loaded only required.
- Other minor tweaks and updates.

bug report #526408 by ambo: Changed the path to admin/settings/better-messages, and changed the access arguments to administer site config. Which is more logical!