Enabled transaction support in the bsddb backend. It uses the anydbm code where possible, only replacing methods where the db is opened (it uses the btree opener specifically.) Also cleaned up some change note generation. Made the backends package work with pydoc too.

recursive-include roundup *.py *.txt *.item *.index *.css *.filter *.newitem
recursive-include cgi-bin *.cgi
recursive-include test *.py *.txt
recursive-include doc *.html *.png *.txt
exclude doc/announcement.txt
include roundup-*
include *.txt