Merge pull request #624 from JeffPyeBrook/sputnick-static-callbacks

Static method declrations
Allow gateway images to be filtered
Merge pull request #626 from leewillis77/payment_images

Allow gateway images to be filtered
Use users table for all customers (visitors and registered)

Also fix cart serialization issue.
Merge branch 'pr-621' of github.com:garyc40/WP-e-Commerce into customer-meta-v3-test

Conflicts:
	wpsc-core/wpsc-constants.php
	wpsc-core/wpsc-functions.php
added missing #id paramter
added routine to check for bots
added meta flag indicating temporary user
implemented temporary profile delete with watchdog
execute the query to update the watchdog counter
take user id from get_user call
Handle the case where a temporary profile is deleted after a valid cookie is created, and the user comes back.  Creates a new profile for the user
don't set cookie on bot requests
a little bit of caching to improve performance
bug fixes