Remove the logic that replaces product images with site header images. Could not find any case where this would be useful.
In any case, the logic was faulty and caused product images to be removed on single product pagews
when using a WP theme that did not support header images.
added wpsc_the_featured_image_fix with deprecated message
Merge pull request #810 from JeffPyeBrook/no-theme-header-image-replace

Remove the logic that replaces product images with site header images.