imagecache 6.x-1.0-alpha2

Changes since DRUPAL-6--1-0-alpha1:

• #266268 by moonshine, add unsharp filters to imagecache.
• #241541 by soxofaan, fix create url tests and url stat caching issue.
• Removing a reference to an undefined variable.
• Small UI improvement, when there are no actions on a preset go ahead and expand the fieldset with the list so the next step is clear.
• Allow imagecache to format filefields.
• update the formatter theme function to use item['data']['alt']
• More consistent labels for the formatters.
• Avoid a fatal error if the filefield module is disabled after setting up imagecache as the formatter.
• Better way of avoiding the problems calling filefield after it's been disabled.
• some theme function fixes and move remove memory limit and toolkit requirements to imageapi gd and imageapi where they belong respectively.
• Removing trailing white space.