Low Profile Functionality

[davjand]

Ready for multicom integration:

1. allow a low profile param to be passed in the processTx event that is passed through to the sagepay api

2. allow a 'redirectToGateway' param to be passed which signals whether or not to redirect to the gateway directly (as it currently does) or to return the redirect URL in the event XML

To clarify:

RedirectToGateway should by default be true. If true is passed in the POST data then the behaviour should be as normal.
If 'false, is passed then the redirect URL should be returned in the event XML for output via the xlst.

I realise that it seems a bit daft having two parameters but I feel that it makes it a bit more flexible (for instance you could have low profile enabled and redirectToGateway to be true so that you could use an iframe throughout.)

Any Q, let me know

[davjand]

Also, can you please document these in the event documentation :)