Add Fix Stoploss in $$ - Best for Real Stress Testing

Stoploss will hit when a certain $$ (input from user) loss is reached.

Why it is important!
Most tastings are failed in real time because test run only in one go and most blowups are avoided because balance has grown much more than our initial deposit.

This feature is very handy in testing.
It tells how strong a strategy is in real time and long run.
If a strategy is profitable on log run it should withstand multiple blowups and still profitable.