liquidateExistingHoldings flag needs improvement

[DerekMelchin]

Expected Behavior

These two algorithms produce the same result:

• https://www.quantconnect.com/terminal/processCache?request=embedded_backtest_e465b6684d8f1600119d56327c61a12c.html
• https://www.quantconnect.com/terminal/processCache?request=embedded_backtest_2e4aa32cb635e83e519c7df012cca173.html

Actual Behavior

They produce different results. The second algorithm ends up in a short position.

Potential Solution

N/A

Reproducing the Problem

Run the algorithms above

System Information

QC Cloud

Checklist

• I have completely filled out this template
• I have confirmed that this issue exists on the current master branch
• I have confirmed that this is not a duplicate issue by searching issues

• I have provided detailed steps to reproduce the issue