[js utils] backport some generic code from comments cube to handle inline ajax form as you get to add comment to entities. Following stuff has been generalized and backported to ease such things: * lazy_view_holder() method on EntityCtxComponent class, to build place holder where the form will be inserted * ajax_composite_form() function in cw.web.views.ajaxedit, to build the form itself * reload() and reloadCtxComponentsSection() javascript function in cubicweb.ajax.js for the javascript processing side

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