issue #99 (Fixes to sales and Debts Report) new file: app/View/SalSales/...

...vreport_customers_debts.ctp | app/View/SalSales/vreport_generator_customers_debts.ctp | modified:   app/Controller/PurPurchasesController.php | app/Controller/SalSalesController.php | app/Model/PurPurchase.php | app/webroot/js/modules/PurPurchases.js | app/webroot/js/modules/SalGraphics.js | app/webroot/js/modules/SalSales.js