* others: xaccGetAccountRoot->xaccAccountGetRoot
* src/engine/messages.h: move this file here
* src/engine/test/test-group-vs-book.c: new file. test group/book
references
* src/engine/test-core/test-engine-stuff.c (get_random_group): new
func
* src/engine/gnc-book.c: (gnc_book_set_group): update group's book
* src/engine/Group.c (xaccGroupGetBook): new func
(xaccGroupSetBook): new func
* src/engine/GroupP.h: add a reference to the group's book
git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@5207 57a11ea4-9604-0410-9ed3-97b8803252fd