Rename solution for turn in.
Rename solution for turn in.
Overload + in Sales to allow concatenation.
Provide removeSale method from Person classes.

Polymorphism used to allow Employees to retain their Worth, yet
customers' worth is decreased.
Remove sale from both parties in Sales.Remove.

Now a static method.
Implement Remove Sale button.
Add ability to select multiple people.

This will concatenate all people's sales into one list and show that
list in the SalesListBox. Currently the Remove Sale button is disabled
when multiple people are selected.
Add error handling to operator+.
Change Sales.Remove to be nonstatic

Pushed responsibility of removing from both employee and customer onto
caller.
Updated suo

I'm not sure which specific commit modified this file.