Reorganize where files appear in doxygen output.

[David Hampton]

Log Message:
-----------
Reorganize where files appear in doxygen output.  A couple of
copyright updates.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src:
        gnc-ui.h
    gnucash/src/business/business-gnome:
        gnc-plugin-page-invoice.c
        gnc-plugin-page-invoice.h
    gnucash/src/core-utils:
        gnc-gconf-utils.h
    gnucash/src/gnome:
        gnc-plugin-page-account-tree.h
        gnc-plugin-page-register.h
    gnucash/src/gnome-utils:
        dialog-preferences.c
        dialog-preferences.h
        druid-gconf-setup.c
        druid-gconf-setup.h
        gnc-embedded-window.h
        gnc-main-window.c
        gnc-main-window.h
        gnc-plugin-file-history.c
        gnc-plugin-file-history.h
        gnc-plugin-manager.h
        gnc-plugin-menu-additions.c
        gnc-plugin-menu-additions.h
        gnc-plugin-page.c
        gnc-plugin-page.h
        gnc-plugin.c
        gnc-plugin.h
        gnc-window.h