Drupal 6.x compatibility upgrade

blade359 has created a Drupal 6 version of this theme, but it markedly differs from the existing theme in appearance. I suggest doing one thing at a time, first making the theme compatible and then examining possible improvements to its style.

The patch I am attaching follows the checklist for compatibility updates in adding aurora.info, moving hook_regions to the info file, changing _phptemplate_variables to aurora_preprocess_node and renaming the region variables.

Furthermore, the searchbox input text field has a new label which interfered with the existing layout, so the label has been made invisible with CSS.

There's an arguable bug that makes multiple line footer text overflow out of the assigned box. I made the footer box fluid-height, aligned its gradient with the bottom edge and set the background color to the top edge of the gradient, so the box height can be expanded without noticable effects.

I hope that the maintainer of this module looks at this. :)