New chapter headers for Internet Protocols and Internet Data chapters,

which replace the existing internet chapter.

Doc/lib/internet.tex

+\chapter{Internet Protocols and Support \label{internet}}
+
+\index{WWW}
+\index{Internet}
+\index{World-Wide Web}
+
+The modules described in this chapter implement Internet protocols and 
+support for related technology.  They are all implemented in Python.
+Some of these modules require the presence of the system-dependent
+module \module{socket}\refbimodindex{socket}, which is currently only
+fully supported on \UNIX{} and Windows NT.  Here is an overview:
+
+\localmoduletable

Doc/lib/netdata.tex

+\chapter{Internet Data Handling \label{netdata}}
+
+This chapter describes modules which support handling data formats
+commonly used on the internet.  Some, like SGML and XML, may be useful 
+for other applications as well.
+
+\localmoduletable