WF sub-account support fixes

* Permission tree updated to better reflect the navigation tree
* Remember last visited screen in WF member's area. Forward there on login automatically.
* Checking if URL (member's area screen) is allowed for a sub-account.
* Other little tweaks:
    - removed Edit button from the module list
    - Important System Notice
    - My Forms

Membership

* Mailer: Unsubscribe link added at the bottom of every message of a mail campaign.
* Image Uploader: both sign-up and edit profile functionality process images exactly the same way AND image thumbnail is being updated instantly. 

Ecommerce

* Product option improvements
    - Multi-select Enum option type
    - Grid View for options
* FedEx Freight Account Number support.
* Removed emails and phone numbers from Shipping Vendor notifications.
* Correct display of Large Text fields in order details and order notifications.

Builder

* Form Builder js code revamped for FireFox compatibility.
* SWFObject support. Flash- and mp3- frames are changed to work via SWFObject - they don't require a click to be activated (which is required in some IE versions).
* Templates to change SWFObject will be revised eventually. This will fix the "flash overlaying flyout menu" issue.