WG5.2 Ch4 Working with Text: Advanced updated

I divided WG4.2 Ch3 (which was quite long) into 3 chapters, which are
now Chs 3, 4, and 5. I previously updated and uploaded Ch3, Working
with Text: Basics. Now I have updated and uploaded WG5.2 Ch4 Working
with Text: Advanced. They are in the Drafts folder along with the
Preface and Chs 1 & 2, ready for someone to review and check for
things I've missed.

Moving on to the new Ch5, Formatting Text.

--Jean