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* Saves Dividend Payments to Security Holdings
Saves information about dividend payments to `SecurityHoldings`. This information will be used to factor in dividend payments to the `Profit` and `NetProfit`.
Adds `SecurityPortfolioManager.TotalNetProfit` to sum all the `SecurityHoldings.NetProfit`.
Adds regression and unit tests.
* Addresses Peer-Review
Improves Regression Test.