Web site revisions

I've started making some more substantial additions and changes to the website for my book. With the latest revisions, you can now see:

• A more detailed description of the book
• The short and long table of contents
• The preface
• The index
• A sample chapter from the book (Chapter 4: File I/O: The Universal I/O Model)
• The source code of all of the example programs in the book, with each file shown as a separate web page (a tarball of the source code will appear later).