ods_style: span listbox title over all listbox columns

bt5/erp5_ods_style/SkinTemplateItem/portal_skins/erp5_ods_style/field_ods_macro.xml

@@ -55,6 +55,7 @@
           <table:table-cell table:number-rows-spanned=\'1\'\n
             table:style-name=\'report-column-title\'\n
             table:number-columns-spanned=\'1\'\n
+            tal:attributes="table:number-columns-spanned python:2 + len(field.get_value(\'columns\'))"\n
             office:value-type=\'string\'>\n
             <text:p tal:content="python:here.Localizer.erp5_ui.gettext(field.get_value(\'title\')).encode(\'utf-8\')">\n
             </text:p>\n