To Do List

Some rewrites that seem appropriate.

• The pre-TOC intro for each chapter looks sort of OK in HTML,
  but is really confusing. They look good in LaTeX, but...
  Remove them.

• Reduce or relocate all of part 1.

• Further simplify part 2.

• Split looping into two chapters.

• Relocate bits-and-bytes and octal and stuff.

• Remove part 12 entirely.

• Rethink part 9.

• Really want to use |bbrk| for "visible space" but HTML output doesn't play
  well. This character's not in the default font.

• Originally (pre-Sphinx) used |lang| and |rang| for optional syntax. Now
  that Sphinx is in use, it's slightly simpler to use |lsqb| and |rsqb|.

• Remove :samp:... where not needed

• Fix ()'s and similar constructs to remove the apostrophe

• Check for any remaining \