[NEW] Basic services for module (execution) and payment (add to cart). Deployment to come...

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49781 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] cart: Make ajaxaddtocart to work now there are services to support it. More feedback and better error handling to come.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49782 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Missing index.php files for the new services (oops)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49784 b456876b-0849-0410-b77d-98878d47e9d5