CHANGE: New user signups now require admin approval

Given that I intend to reveal much more data to new users this seems necessary...

RIGS/admin.py

@@ -22,13 +22,20 @@ admin.site.register(models.Invoice)
 admin.site.register(models.Payment)
 
 
+def approve_user(modeladmin, request, queryset):
+    queryset.update(is_approved=True)
+approve_user.short_description = "Approve selected users"
+
+
 @admin.register(models.Profile)
 class ProfileAdmin(UserAdmin):
+    # Don't know how to add 'is_approved' whilst preserving the default list...
+    list_filter = ('is_approved', 'is_active', 'is_staff', 'is_superuser', 'groups')
     fieldsets = (
         (None, {'fields': ('username', 'password')}),
         (_('Personal info'), {
             'fields': ('first_name', 'last_name', 'email', 'initials', 'phone')}),
-        (_('Permissions'), {'fields': ('is_active', 'is_staff', 'is_superuser',
+        (_('Permissions'), {'fields': ('is_approved', 'is_active', 'is_staff', 'is_superuser',
                                        'groups', 'user_permissions')}),
         (_('Important dates'), {
             'fields': ('last_login', 'date_joined')}),
@@ -41,6 +48,7 @@ class ProfileAdmin(UserAdmin):
     )
     form = forms.ProfileChangeForm
     add_form = forms.ProfileCreationForm
+    actions = [approve_user]
 
 
 class AssociateAdmin(VersionAdmin):