Add functionality for Clickmap

I modified omniture.module to include a setting to enable/disable Clickmap, and if that setting is enabled, there is now an init_hook() method to drupal_add_js() a new JS file that uses jQuery to modify the click event for all a tags accordingly.

I rolled a patch but adding new files to CVS patches is a much more difficult process than simply adding it as an attachment. Please rename omniture.clickmap.txt to omniture.clickmap.js and put it in a new omniture/js directory.

Two files attached for review, thanks!