Added SubType enum

Only has Page, Book, Article, Chapter and Volume.

There may be a need for more.
Added 'Section' to bibLevel
bumped pom to 1.1.41
Merge pull request #65 from nla/hr-enums

Added SubType enum; Add section bibLevel
Merge branch 'master' of github.com:nla/amberdb into load-work
merging foolery