Removed duplicated requires.

htdocs/compta/ajaxpayment.php

htdocs/core/boxes/box_graph_invoices_permonth.php

htdocs/core/boxes/box_graph_invoices_supplier_permonth.php

htdocs/core/boxes/box_graph_orders_permonth.php

htdocs/core/boxes/box_graph_orders_supplier_permonth.php

htdocs/core/boxes/box_graph_product_distribution.php

htdocs/core/boxes/box_graph_propales_permonth.php

htdocs/main.inc.php

htdocs/product/stock/massstockmove.php

test/phpunit/JsonLibTest.php