Minor updates

Fixed issue #1553. Was also going to automatically enable anyone can
register if force user registration was enabled, but saw that was
already done. Instead I updated the description text so users know it
will be enabled for them.
Restore lost action for advanced options.  Fixes #1563.
Merge pull request #1561 from keliix06/master

Minor updates
Fix purchase log clear download locks - expecting 'purchaselog_id' query but 'id' passed instead.
Update wpsc-sv_SE.po
Merge pull request #1568 from chrillep/patch-1

Update wpsc-sv_SE.po
Merge pull request #1567 from benhuson/clear_download_locks

Fix purchase log clear download locks
Fixes for the last PR
Merge branch 'master' of github.com:wp-e-commerce/WP-e-Commerce into paypal-fork