series does not deal with calcd_rating... 
	(on edit could, recalc as a catch-all, and obviously if we change a single book's rating, we should re-calc)

alter a condition, covertype, etc. and its not in drop-down list (even though db look via index is correct, e.g books.html shows updated covertype)

book form is not validating (year published)

search only retrieves books (so if I retrieve a sub-book, its not obvious - do I care?)

when editing a sub-book, you can change fields that are impossible (e.g.  covertype/condition - as they are physical)