NEW Extrafields support formulas to be computed using PHP expressions

htdocs/contact/list.php

htdocs/core/actions_extrafields.inc.php

htdocs/core/class/extrafields.class.php

htdocs/core/lib/functions.lib.php

htdocs/core/tpl/admin_extrafields_add.tpl.php

htdocs/core/tpl/admin_extrafields_edit.tpl.php

htdocs/core/tpl/admin_extrafields_view.tpl.php

htdocs/install/mysql/migration/5.0.0-6.0.0.sql

htdocs/install/mysql/tables/llx_extrafields.sql

htdocs/langs/en_US/admin.lang

htdocs/langs/en_US/main.lang

htdocs/modulebuilder/skeletons/skeleton_list.php

htdocs/projet/list.php

htdocs/projet/tasks/list.php

htdocs/societe/class/societe.class.php

htdocs/societe/list.php