More detailed title fields

The current version concatenates the key title subfields from 245. That's fine for many cases, but I would also like to have more detailed and structured title info available. Specifically, I want to have the a and b subfields separate, so I can easily apply different css styles to make the main part of the title (a) bigger compared to the remainder (b and p). And also, I think it's valuable to have the author information in c available -- on my site, it's friendlier and often more accurate to present the original author data from 245 to the user. (Of course, the more formal author fields are also used elsewhere, for example taxonomies..)

This patch also includes a modification which puts the title extraction together with several other extraction operations. Plus there's a debug feature in the millennium tools to present the raw biblio array.