Upgrade rose edit to Python 3

.gitignore

@@ -5,6 +5,7 @@ etc/opt
 doc
 venv
 metomi_rose.egg-info
+build
 dist
 node_modules
 

ACKNOWLEDGEMENT.md

@@ -3,15 +3,15 @@
 Licences for non-Rose works included in this distribution can be
 found in the licences/ directory.
 
-etc/images/rose-icon.png,
-etc/images/rose-icon.svg,
-etc/images/rose-icon-trim.png,
-etc/images/rose-icon-trim.svg,
-etc/images/rose-logo.png,
-etc/images/rosie-icon.png,
-etc/images/rosie-icon.svg,
-etc/images/rosie-icon-trim.png,
-etc/images/rosie-icon-trim.svg,
+metomi/rose/etc/images/rose-icon.png,
+metomi/rose/etc/images/rose-icon.svg,
+metomi/rose/etc/images/rose-icon-trim.png,
+metomi/rose/etc/images/rose-icon-trim.svg,
+metomi/rose/etc/images/rose-logo.png,
+metomi/rose/etc/images/rosie-icon.png,
+metomi/rose/etc/images/rosie-icon.svg,
+metomi/rose/etc/images/rosie-icon-trim.png,
+metomi/rose/etc/images/rosie-icon-trim.svg,
 metomi/rose/etc/rose-all/etc/images/icon.png,
 metomi/rose/etc/rose-meta/rose-all/etc/images/icon.png
 * These icons are all derived from the public domain image at

demo/rose-config-edit/demo_meta/app/01-types/meta/rose-meta.conf

@@ -177,7 +177,7 @@ values=1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21
 description=A variable with 5 values (& value-titles) using radiobuttons
 value-titles=A title, B title, C title, D title, E title
 values='a', 'b', 'c', 'd', 'e'
-widget[rose-config-edit]=rose.config_editor.valuewidget.radiobuttons.RadioButtonsValueWidget
+widget[rose-config-edit]=metomi.rose.config_editor.valuewidget.radiobuttons.RadioButtonsValueWidget
 
 [namelist:nl2]
 duplicate=true
@@ -194,7 +194,7 @@ values=4
 
 [namelist:table_nl]
 description=A page containing a custom table layout
-widget[rose-config-edit]=rose.config_editor.pagewidget.table.PageArrayTable
+widget[rose-config-edit]=metomi.rose.config_editor.pagewidget.table.PageArrayTable
 
 [namelist:table_nl=my_boolean_array]
 description=A boolean array of length 5