Currently we rely on any N: field with a Change: subnotice being the first
N: field. Add --contains field to abcfield.py to remove this restriction.
Also use it to extract new subfield Credit: and add that if present
to the tune information in print and on web.
This way the titles remains a constant size even if the image needs to be scaled.
And we have that text appearance under our control.
I can't find a way of switching off the tune title in abcm2ps, and have worked around
by setting the title format to Y0. Y is not a defined ABC header and is not found in
any Dottes tune.
1. Purple background on the front and and new blank back pages.
2. UK English for hyphenation and date presentation.
3. Dedication and 'About Havoc' section.
4. Footer just page number in centre of page.
5. Revised copyright discussion.
6. Since it's a book, make content, intro and first lines to chapters.
And prompt individual tunes to sections.
7. Omit 'Tunes' chapter heading. It doesn't look good in A5.
A lot of stuff was being duplicated between different page size. Consolidate where
possible, and in particular put as much into a single source file (dottes.tex) as
possible. Making a single Booke is now potentially quicker, as the tune pages
don't necessarily have to be regenerate every time.