Plot the Investments and Expenses
Produces a plot of the investments, expenses and net investment.
plot_investments_expense(investment_vector, expense_vector, output_path)
a vector of annual investments
a vector of annual withdrawals
file path to a folder in which the graph will be saved, NULL indicates plot, don't save
No explicit returned values, merely the side-effects of a graph named 'investments_expense.png' written to output_path
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