Small fixes to ZODB history tab

Assorted fixes for minor issues with ZODB History tab:

1. When viewing history of a website or websection in the "backoffice" interface, clicking on *View ZODB History* does not keep the `ignore_layout:int=1` request parameter that forces displaying the forms in the *View* skin selection.
2. Fix using ZODB history for documents with binary properties, such as `data` property on images and files. Instead of failing with unicode error, just display "(binary)". 
3. Put the link field in center group, forms with only fields in left group and nothing in right group have a border only on the left side. ( this is  https://www.erp5.com/documentation/developer/guideline/module/erp5-Guideline.Module.Creation/#listbox-only-tabs-should-have-a-read-only-title-in-center-group )

see before:
![before__1_](/uploads/eaafe271228e960f58b7b928cb517ac9/before__1_.png)

and after:
![Screenshot_2017-11-28_at_19.32.09](/uploads/bdd0adcc80b138dca7ddcb45b2ff184a/Screenshot_2017-11-28_at_19.32.09.png)



/reviewed-on nexedi/erp5!512

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_getZODBHistoryList.py

@@ -8,7 +8,15 @@ if not getSecurityManager().getUser().has_permission('View History', context):
   raise Unauthorized()
 
 def beautifyChange(change_dict):
-  return ["%s:%s" % (k,change_dict[k]) for k in sorted(change_dict.keys())]
+  change_list = []
+  for property_name, property_value in sorted(change_dict.items()):
+    if isinstance(property_value, basestring):
+      try:
+        unicode(property_value, 'utf-8')
+      except UnicodeDecodeError:
+        property_value = '(binary)'
+    change_list.append('%s:%s' % (property_name, property_value))
+  return change_list
 
 try:
   history_size = portal.portal_preferences.getPreferredHtmlStyleZodbHistorySize()

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_viewHistory/your_zodb_history.xml

@@ -313,7 +313,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>string:${here/absolute_url}/Base_viewZODBHistory</string> </value>
+            <value> <string>python:\'{}/Base_viewZODBHistory?{}\'.format(context.absolute_url(), modules[\'ZTUtils\'].make_query(ignore_layout=request.get(\'ignore_layout\', 0)))</string> </value>
         </item>
       </dictionary>
     </pickle>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_viewZODBHistory.xml

@@ -82,7 +82,9 @@
                 <item>
                     <key> <string>center</string> </key>
                     <value>
-                      <list/>
+                      <list>
+                        <string>your_workflow_history</string>
+                      </list>
                     </value>
                 </item>
                 <item>
@@ -96,9 +98,7 @@
                 <item>
                     <key> <string>left</string> </key>
                     <value>
-                      <list>
-                        <string>your_workflow_history</string>
-                      </list>
+                      <list/>
                     </value>
                 </item>
                 <item>

product/ERP5/tests/testZODBHistory.py

@@ -28,6 +28,7 @@
 ##############################################################################
 
 import unittest
+import os
 
 from Products.ERP5Type.tests.ERP5TypeTestCase import ERP5TypeTestCase
 
@@ -122,7 +123,7 @@ class TestZODBHistory(ERP5TypeTestCase):
     # should be: create(1) + edit(60) = 61
     self.assertEqual(len(history_list), 61)
 
-  def test_testZODBHistorySecurity(self):
+  def test_ZODBHistorySecurity(self):
     """
      Make sure ZODB History is not available when user does not have "View History" permission.
     """
@@ -144,6 +145,31 @@ class TestZODBHistory(ERP5TypeTestCase):
     from zExceptions import Unauthorized
     self.assertRaises(Unauthorized, document.Base_viewZODBHistory)
 
+  def test_ZODBHistoryBinaryData(self):
+    """
+     Make sure ZODB History view works with binary content
+    """
+    self.loginByUserName('tatuya')
+    document = self.addOrganisation(self.id()).newContent(
+        portal_type='Embedded File')
+
+    document.setFile(
+        open(os.path.join(
+          os.path.dirname(__file__),
+          'test_data',
+          'images',
+          'erp5_logo.png')))
+    document.setTitle("ロゴ")
+    self.commit()
+
+    # no encoding error
+    document.Base_viewZODBHistory()
+
+    change, = document.Base_getZODBHistoryList()
+    self.assertIn('data:(binary)', change.getProperty('changes'))
+    self.assertIn('content_type:image/png', change.getProperty('changes'))
+    self.assertIn('title:ロゴ', change.getProperty('changes'))
+
 
 def test_suite():
   suite = unittest.TestSuite()