TickerAll: Copy trading

We're planning copy trading — automatically mirror trades from a master (leader) account to one or more follower accounts, all through the TickerAll API. This issue tracks the work; follow it for updates. Tell us how you'd use it — which brokers, the allocation model you'd want (fixed lot, proportional to balance/equity, or risk-based), and the controls that matter (per-follower risk caps, symbol filters, max drawdown, reverse-copy) — and we'll fold your input into the design.