Ignore-this: c64d11a84437b159ac3b6b5ff4b6d336
* `session' now has a `session-frame-class' method to generate the
  session frame class similar to how `application' uses
  `session-class' for the session class
* Default to `standard-session-frame' for `basic-session'
* `make-next-frame' now accepts the session in which the frame is
  being created as the first argument to allow using the generated
  session frame class

darcs-hash:81297cd28d4393442638e6f6a1e4099b526a37b5