icon path wrong with submenu

When you define submenu in act_window the path to load icon is wrong.

here a patch proposed

=== modified file 'bin/widget/view/form.py'
--- bin/widget/view/form.py 2011-01-13 06:54:27 +0000
+++ bin/widget/view/form.py 2011-12-13 05:03:51 +0000
@@ -112,7 +112,7 @@
             for sub in eval(submenu):
                 sbutton = gtk.Button()
                 icon = gtk.Image()
- file_path = os.path.realpath("icons")
+ file_path = os.path.realpath("bin/icons")
                 iname = sub.get('icon', 'terp-marketing').split('-')[1]
                 pixbuf = gtk.gdk.pixbuf_new_from_file(file_path + '/' + iname + '.png')
                 icon_set = gtk.IconSet(pixbuf)