Promote the register style options to the 'Edit' menu per Gnome HIG 2.0.

[David Hampton]

Log Message:
-----------
Promote the register style options to the 'Edit' menu per Gnome HIG
2.0.  Rework the various sort, status and date menu items into the HIG
"Sort By" and "Filter By" menus.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash/src/gnome:
        gnc-plugin-page-register.c
    gnucash/src/gnome/ui:
        gnc-plugin-page-register-ui.xml
    gnucash/src/gnome/glade:
        register.glade