Finish pulling all references to the old "gnucash network" code.

[David Hampton]

Log Message:
-----------
Finish pulling all references to the old "gnucash network" code.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/app-utils:
        prefs.scm
    gnucash/src/gnome:
        Makefile.am
        top-level.c
    gnucash/src/gnome-utils:
        gnc-html.c
        gnc-html.h
        gw-gnome-utils-spec.scm

Removed Files:
-------------
    gnucash/src/gnome:
        gnc-network.c
        gnc-network.h