'total' argument in BaseList.paginate needed?

[toirl]

The paginate method of the BaseList has since recent versions a new 'total' argument. I am currently not sure why this needs to be provided to the method as the total size if the list can be obtained from the list itself. This change breaks the API in other applications as the call of paginate now requires an extra argument.

7fbf08a sets a default value for total and set the value to the len of self.items. This seems to be OK in most cases.

TODO:
Check if there is any usecase where providing total as extra argument makes sense.