Emergency shutdown through web dashboard

[evanhft]

Ability to manually intervene

1. suspend API
2. liquidate portfolio
3. cancelling open orders

[whitnable]

This functionality is currently implemented though as three separate steps.

One can suspend the submission of new orders. Setting this will inhibit the API from placing any new orders. This is done by toggling the 'Trades Suspended' option in the Account Configuration tab.

One can then cancel all open orders. This is done by selecting all orders and then clicking 'Cancel Open Orders' in the Orders tab.

Finally, one can liquidate the entire portfolio. This is done by selecting all positions and then clicking 'Liquidate Selected Positions' in the Positions tab.