Changes to get Beginners booke building. The web pages include prev and next links, so to get those right we have to make the tune filenames distinct from the main booke names. So fall back to taking the easy way, and just prefix all tune names with @ or _.

This book provides the dots for the music to all the dances
performed by Cry Havoc. The name of the dance is given as the tune title.
If the name of the tune differs from the name of the dance, the tune
name is given in the subtitle.