docs: def create_group(self, title = None, parent = None, image = 1,
                       y = 2999, mon = 12, d = 28, h = 23, min_ = 59,
                       s = 59):
          """This method creates a new group.
  
          A group title is needed or no group will be created.
  
          If a parent is given, the group will be created as a sub-group.
  
          title must be a string, image an unsigned int >0 and parent a v1Group.
  
          With y, mon, d, h, min_ and s you can set an expiration date like on
          entries.
  
          """
          
          if title is None:
              raise KPError("Need a group title to create a group.")
          elif type(title) is not str or image < 1 or(parent is not None and \
              type(parent) is not v1Group) or type(image) is not int:
              raise KPError("Wrong type or value for title or image or parent")
  
          id_ = 1
          for i in self.groups:
              if i.id_ >= id_:
                  id_ = i.id_ + 1
          group = v1Group(id_, title, image, self)
          group.creation = datetime.now().replace(microsecond=0)
          group.last_mod = datetime.now().replace(microsecond=0)
          group.last_access = datetime.now().replace(microsecond=0)
          if group.set_expire(y, mon, d, h, min_, s) is False:
              group.set_expire()
          
          # If no parent is given, just append the new group at the end
          if parent is None:
              group.parent = self.root_group
              self.root_group.children.append(group)
              group.level = 0
              self.groups.append(group)
          # Else insert the group behind the parent
          else:
              if parent in self.groups:
                  parent.children.append(group)
                  group.parent = parent
                  group.level = parent.level+1
                  self.groups.insert(self.groups.index(parent)+1, group)
              else:
                  raise KPError("Given parent doesn't exist")
          self._num_groups += 1
          return True