reledit refactoring
* js handling rewritten to exploit all form capabilities (such as file upload ...)
* attribute-like composite relations (one ttype, cardinality in '?1' from composite side) are more
cutely handled, with a 'add'/'delete' additional actions/icons
* a reledit_ctrl rtag to finely control: reloading, edition and default values
* a proper chapter in the documentation (book)
* many bugfixes
<table class="attributeForm" style="width:100%;"
tal:attributes="id tab_id | nothing;
class tab_class | nothing;">
<tr tal:iter="widget lines">
<th class="labelCol" tal:content="structure python:widget.render_label(entity)">attrname</th>
<td tal:define="error python:widget.render_error(entity)" style="width:100%;"
tal:attributes="class python:error and 'error' or nothing">
<div tal:replace="structure error">error message if any</div>
<div tal:replace="structure python:widget.edit_render(entity)" >widget (input, textarea, etc.)</div>
<div tal:replace="structure python:widget.render_help(entity)">format help if any</div>
</td>
</tr>
</table>