Reinstaing margin trading on Bitfinex

[eniware-org]

I understand the shortcomings of the bot when used for margin trading was the reason for the removal of this functionality in one of the latest releases. @ctubio mentioned that "much simplified version" is in the making, but no specific plans so far.
However, margin trading is important for me as I wish to keep only crypto in my wallets and minimize fiat holdings. I am sure it will be welcomed by other users.
Few things to consider:

1. Bot shall be aware of the liquidation price of the position. Even better, the minimum liquidation price (for long) and maximum (for short) should be at least configurable via UI.
2. Leverage to be configurable regardless of the exchange maximum leverage.
3. Ability to switch from long to short and back.
4. It will be nice to have manual control for position increase/decrease - for example to increase long position under bull conditions, while respecting leverage/liquidation price level. This is where the bot could really excel!