* NEWS: 0.21 updates
* configure.in: 0.21
* doc/Makefile.am: add all XMLTO usage to DBUS_XML_DOCS_ENABLED
* python/Makefile.am: change to avoid dist of dbus_bindings.c so
you don't need pyrex to make dist
* qt/Makefile.am (libdbus_qt_1_la_SOURCES): add integrator.h to
sources; run moc
* python/dbus.py: Add the actual message when calling the reciever
of a signal such that parameters can be inspected. Add the method
remove_signal_receiver
* python/dbus_bindings.pyx.in (MessageIter.get): fixed typo in
argtype to arg_type when raising unknown arg type exception.
Changed type list to reflect the changes in dbus-protocol.h so
the bindings actually work.