Duplicate entry for successive calls to the IPN

[drzraf]

Some module "manually" send OrderHistory()->changeIdOrderState().
This is the case for IPN URL called when a payment system confirm/cancel/... a payment.
The point for the payment modules is to update the order using newer information.

But initFromContext always call SalesforceSQL::save which trigger an INSERT using an (already existing) id (PRIMARY KEY).

I don't know what the best fix is.

[drzraf]

see commit drzraf/salesforce@b8541770a55

[drzraf]

but when only IP address and date are changed, it may not have to be updated... dunno