erp5_core: display erp5 based web sites html

Most ERP5 web sites use a global form wrapping the content.
Modify the html viewer to not drop this content.

bt5/erp5_dms_ui_test/PathTemplateItem/portal_tests/dms_zuite/testPortalContributionsToolNewLink.zpt

@@ -37,44 +37,20 @@
   <td></td>
 </tr>
 
-<!-- gadget's iframe -->
+<!-- gadget editor html_viewer -->
 <tr>
   <td>waitForElementPresent</td>
-  <td>//div[@data-gadget-scope="editor"]/iframe</td>
+  <td>//div[@data-gadget-scope="editor"]</td>
   <td></td>
 </tr>
 <tr>
-  <td>selectFrame</td>
-  <td>//div[@data-gadget-scope="editor"]/iframe</td>
+  <td>assertElementPresent</td>
+  <td>//div[@data-gadget-scope="editor"]//h2[contains(text(), "innovative Unified Business Model")]</td>
   <td></td>
 </tr>
-
-
-<!-- ckeditor's iframe -->
 <tr>
-  <td>waitForElementPresent</td>
-  <td>//iframe</td>
-  <td></td>
-</tr>
-<tr>
-  <td>selectFrame</td>
-  <td>//iframe</td>
-  <td></td>
-</tr>
-
-<tr>
-  <td>waitForElementPresent</td>
-  <td>//div</td>
-  <td></td>
-</tr>
-<tr>
-  <td>verifyTextPresent</td>
-  <td>innovative Unified Business Model</td>
-  <td></td>
-</tr>
-<tr>
-  <td>verifyTextPresent</td>
-  <td>Nexedi</td>
+  <td>assertElementPresent</td>
+  <td>//div[@data-gadget-scope="editor"]//a[contains(text(), "Nexedi")]</td>
   <td></td>
 </tr>
 

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/gadget_html_viewer.js.js

@@ -103,8 +103,6 @@
       SCRIPT: true,
       STYLE: true,
       NOSCRIPT: true,
-      FORM: true,
-      FIELDSET: true,
       INPUT: true,
       SELECT: true,
       TEXTAREA: true,