Add most of the missing type objects to __builtin__.

Adds the following:
ellipsis (not to be confused with Ellipsis, which is the object of this 
type)
builtin_function_or_method
dictproxy
generator
PyCObject
classobj
instance
instancemethod
cell
NoneType
NotImplementedType
frame
function
module
traceback
code

Does not add the rest of the names mentioned in my email, as I'm 
unsure if they got an approval or were silently ignored. I'm not 
convinced that it's a good idea to put the rest in __builtin__, myself.

See also:
<http://mail.python.org/pipermail/python-dev/2004-August/
047754.html>
and
<http://mail.python.org/pipermail/python-dev/2004-August/
047830.html>