Neil Williams' QOF book merge patch #1.

[Derek Atkins]

Log Message:
-----------
Neil Williams' QOF book merge patch #1.

	  Includes
	  qof_book_merge.c
	  qof_book_merge.h
	  test-book-merge.c test routine
	  New Account Hierarchy druid 
	  Sundry adjustments to QOF support.
	  Tweaks to several Makefile.am files to support new files.
	  Tweaks to window-main.c to support new menu item
	  Changes to druid-hierarchy.c to support the merge druid.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/business/business-core:
        gncAddress.c
        gncAddress.h
        gncBillTerm.c
        gncCustomer.c
        gncCustomer.h
        gncEntry.h
        gncJob.h
        gncOrder.c
        gncTaxTable.c
        gncTaxTable.h
    gnucash/src/engine:
        Makefile.am
        gnc-pricedb.c
    gnucash/src/engine/test:
        Makefile.am
    gnucash/src/gnome:
        Makefile.am
        druid-hierarchy.c
        druid-hierarchy.h
        window-main.c
    gnucash/src/gnome/glade:
        Makefile.am

Added Files:
-----------
    gnucash/src/engine:
        qof_book_merge.c
        qof_book_merge.h
    gnucash/src/engine/test:
        test-book-merge.c
    gnucash/src/gnome:
        druid-merge.c
        druid-merge.h
    gnucash/src/gnome/glade:
        merge.glade