Actually implemented

I have started to build a proof of concept that actually implments code that does stuff, so can't actually post that code here, but basically it follows the same structures, with a command being sent via the Controller, and then being run across the model (and hence the data). The notification of errors is done by the Notify mechanism, with whatever view knowing what to do with the errors statuses returned for each possible input.

Once a change to client, stock, buy/sell, etc has been entered, then at the the moment the Notify mechanism is directly fired, but what should happen is that the whole order should be validated at this point, allowing for cascadimg errors to be flagged.

We will see on monday!