SearchForm no longer creates a new SearchCriteria unless its current one is null.
Fixed the way start and end dates are set in SearchForm.startDate and .endDate; uses existing searchCriteria dates more gracefully.
Added SimpleStringProperty results property to SearchResults class
Added property listener to ReceiptForm
Added button handlers to SearchResults class
Added stores combobox to SearchForm.fxml
Added logic to SearchForm class so that the comboxes in SearchForm.fxml are loaded.
Fixed NPE bug in SearchForm class' handling of change event for cbPrimaryCat
Added checks for null and/or empty values in SearchForm class when building sql statement
Added handler to SearchResults to do new search when returning from SearchForm
Added observable property to SearchCriteria to indicate new or modified search conditions
Made ReceiptForm.searchCriteria private and removed instantiation of new criteria variable from the doSearch method