Update to 4.8:

SIP v4.8 has been released. The highlights of this release include
support for Python v3, the ability to supply alternate super-types
and meta-types for wrapped objects, and documentation built using
Sphinx.

The major new features are:

  * support for Python v3
  * the %BIGetBufferCode and %BIReleaseBufferCode to
    support the buffer interface of Python v3
  * the %DefaultMetatype directive and the
    /Metatype/ class annotation to allow the
    meta-type of a wrapped type to be changed
  * the %DefaultSupertype directive and the
    /Supertype/ class annotation to allow the
    super-type of a wrapped type to be changed
  * the sip.simplewrapper type to be used as a
    super-type for wrapped types that don't take
    part in parent/child relationships
  * the %InitialisationCode directive
  * the /KeepReference/ argument annotation
  * the /Encoding/ argument, function, typedef and
    variable annotation
  * super() now works as expected with wrapped types
  * support for __floordiv__, __ifloordiv__,
    __truediv__, __itruediv__ and __index__
  * __bool__ is a synonym for __nonzero__
  * Sphinx is now used for the documentation
  * many additions and deprecations in the API to
    eliminate the differences between classes and
    mapped types. (See the documentation for the
    details.)

(wiz)