KRACOEUS-7695 : budget income summary attempt 1

I have added a DTO class ( coeus-impl/src/main/java/org/kuali/coeus/common/budget/framework/income/BudgetPeriodIncomeTotal.java ) , a  p:methodToCall="showBudgetPeriodIncomeSummary" in the xml page and the java method showBudgetPeriodIncomeSummary in the controller. The showBudgetPeriodIncomeSummary is being called, but the page won't display the table. Please take a look, tell me what I  need to change. Thanks! 
I think I'd rather this string constant were in the KRAD XML and not here. You should be able to have the first column be a message with "Period @{#line.periodNumber}" or something similar.