Allow Spaces in Product Image File Names/URLs

Older WP e-Commerce installations can have uploaded product images with file names that contain spaces.

For these products, trying to view the product's full sized image does not work because due to a bug in WordPress (http://core.trac.wordpress.org/ticket/23605), spaces are removed from the image link/path.

This bug affects individual product pages, and any other category pages that display the product's image.

This fix is a simple workaround, which ensures that spaces in image file names are preserved.
Ensure Product Image Thumbnails with spaces work correctly in the Dashboard

Ensures that when viewing Dashboard, Products (/wp-admin/edit.php?post_type=wpsc-product), the product thumbnail images display correctly if they have spaces in the filename.
Merge pull request #413 from om4james/productimagespaces

Allow Spaces in Product Image File Names/URLs