WIP: py2/py3: store file content as it is in Business Template for PathTemplateItem.

If we have a portal_type definition and its instances in the same Business Template,
_importFile() creates broken objects in PathTemplateItem._objects for such instances and
they will be 'fixed' in install() timing. But in Python 3, it does not work because :

while importing a content file, like *.js...

(BusinessTemplate.py)
     try:
       setattr(obj, property_name, data)
     except BrokenModified:
       obj.__Broken_state__[property_name] = data # <-- !!!
       obj._p_changed = 1

obj.__Broken_state__ access here also raises BrokenModified.

while importing an XML file...

(ZODB/broken.py)
    def __new__(class_, *args):
        result = object.__new__(class_) # <-- !!!
        result.__dict__['__Broken_newargs__'] = args
        return result

we get an exception 'TypeError: object.__new__(Portal Type) is not safe, use Base.__new__()'

product/ERP5/Document/BusinessTemplate.py

@@ -941,7 +941,7 @@ class ObjectTemplateItem(BaseTemplateItem):
       # ObjectTemplateItem.__init__()
       # XXX - the above comment is a bit unclear,
       # still not sure if this is handled correctly
-      if file_obj.name.rsplit(os.path.sep, 2)[-2] == 'portal_components':
+      if obj_key.split(os.path.sep, 1)[0] == 'portal_components':
         self._archive[obj_key] = None
         try:
           del self._archive[obj_key[len('portal_components/'):]]
@@ -1679,6 +1679,7 @@ class PathTemplateItem(ObjectTemplateItem):
     id_list = ensure_list(self._archive.keys())
     self._archive.clear()
     self._path_archive = PersistentMapping()
+    self._files = PersistentMapping()
     for id in id_list:
       self._path_archive[id] = None
 
@@ -1770,6 +1771,8 @@ class PathTemplateItem(ObjectTemplateItem):
         obj.wl_clearLocks()
 
   def install(self, context, *args, **kw):
+    for file_name, data in six.iteritems(self._files):
+      super(PathTemplateItem, self)._importFile(file_name, BytesIO(data))
     super(PathTemplateItem, self).install(context, *args, **kw)
 
     # Regenerate local roles for all paths in this business template
@@ -1809,6 +1812,9 @@ class PathTemplateItem(ObjectTemplateItem):
                 % (portal_type, obj.getRelativeUrl()))
       transaction.get().addBeforeCommitHook(updateLocalRolesOnDocument)
 
+  def _importFile(self, file_name, file_obj):
+    self._files[file_name] = file_obj.read()
+
 class ToolTemplateItem(PathTemplateItem):
   """This class is used only for making a distinction between other objects
   and tools, because tools may not be backed up.