[REF] web_kanban: allow a custom limit defined in the arch

With this commit, it's now possible to set an arbitrary limit on any
kanban view by adding a limit attribut to the root kanban tag in a
kanban definition.

addons/web_kanban/static/src/js/kanban_view.js

@@ -62,7 +62,7 @@ var KanbanView = View.extend({
 
         this.qweb = new QWeb(session.debug, {_s: session.origin});
 
-        this.limit = this.options.limit || 40;
+        this.limit = this.options.limit || parseInt(this.fields_view.arch.attrs.limit, 10) || 40;
         this.fields = {};
         this.fields_keys = _.keys(this.fields_view.fields);
         this.grouped = undefined;