Add some chapter introductions (not linked into the LibRef yet)

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+\chapter{Data Persistence}
+\label{persistence}
+
+The modules described in this chapter support storing Python data in a
+persistent form on disk.  The \module{pickle} and \module{marshal}
+modules can turn many Python data types into a stream of bytes and
+then recreate the objects from the bytes.  The various DBM-related
+modules support a family of hash-based file formats that store a
+mapping of strings to other strings.  The \module{bsddb} module also
+provides such disk-based string-to-string mappings based on hashing,
+and also supports B-Tree and record-based formats.
+
+The list of modules described in this chapter is:
+
+\localmoduletable