Merge remote-tracking branch 'Upstream/develop' into develop-remove_zero

dev/codesniffer/ruleset.dtd

htdocs/comm/action/class/actioncomm.class.php

htdocs/core/class/conf.class.php

htdocs/core/class/dolreceiptprinter.class.php

htdocs/core/js/lib_head.js.php

htdocs/core/modules/dons/html_cerfafr.html

htdocs/core/modules/modFacture.class.php

htdocs/index.php

htdocs/langs/en_US/bills.lang

htdocs/public/test/test_arrays.php

htdocs/public/test/test_forms.php

htdocs/theme/eldy/style.css.php

htdocs/theme/md/style.css.php