Fix several bugs reported by scrutinizer

htdocs/admin/prelevement.php

htdocs/admin/triggers.php

htdocs/categories/admin/categorie_extrafields.php

htdocs/categories/categorie.php

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

htdocs/comm/fiche.php

htdocs/compta/bank/class/account.class.php

htdocs/compta/bank/fiche.php

htdocs/compta/deplacement/class/deplacement.class.php

htdocs/compta/deplacement/document.php

htdocs/compta/facture.php

htdocs/compta/paiement/info.php

htdocs/core/class/html.form.class.php

htdocs/install/mysql/migration/3.6.0-3.7.0.sql

htdocs/install/mysql/tables/llx_bank_account.sql