[PICA] Handle multiple paginations and multi-volume works

Closes #755
You're right...  (you didn't paste the permalinks :-) Anyway, I don't think we (you) have to cover all cases, some are weird and rare and it doesn't worth it. Even a small improvement, i.e. roman pagination of single vol will be actually a great improvement. As I wrote in my OP, 40% my books are of this kind (single vol, multiple pagination).