Add lines per page option

Add default sales discount option
Fix supplier pagination

database/database.sql

@@ -64,7 +64,9 @@ INSERT INTO `ospos_app_config` (`key`, `value`) VALUES
 ('print_top_margin', '0'),
 ('print_left_margin', '0'),
 ('print_bottom_margin', '0'),
-('print_right_margin', '0');
+('print_right_margin', '0'),
+('default_sales_discount', '0'),
+('lines_per_page', '25');
 
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