The booklet.pdf file needs flipped on the short side of the paper for it
to print properly within other books.  The booklet.pdf file can remain
in landscape mode - it'll print fine on its own when flipped on the long
edge.

The books now keep common makefile commands in config/vars.  A new
command will give pdfs titles according to the first header in the
README file.

They don't like to be compiled without rules or docs. Perhaps
they get lonely.