Add module reference for cPickle to index.

Add module reference for cPickle to index.

Consistency:  Always use trailing "()" for function and method names in text.

Consistency:  Always mark parameter names with \var{} in text.

Change questionable text about CORBA to definate text about XDR; "CORBA" isn't
enough to specify an external representation, and I'm not sure the comment is
right if we say "IIOP".  I know its right about XDR if we only mention shared
object references and not recursive structures.