Revert "Remove unused UserList.addable property."

It turns out it wasn't so unused. :(

This reverts commit 984585d54b681d721d33ec614e9b58ae2f39cf2a.

r2/r2/lib/pages/pages.py

@@ -2810,8 +2810,11 @@ class UserList(Templated):
     destination    = "friend"
     remove_action  = "unfriend"
 
-    def __init__(self, editable=True):
+    def __init__(self, editable=True, addable=None):
         self.editable = editable
+        if addable is None:
+            addable = editable
+        self.addable = addable
         Templated.__init__(self)
 
     def user_row(self, row_type, user, editable=True):
@@ -2894,8 +2897,8 @@ class EnemyList(UserList):
     type = 'enemy'
     cells = ('user', 'remove')
     
-    def __init__(self, editable=True):
-        UserList.__init__(self, editable)
+    def __init__(self, editable=True, addable=False):
+        UserList.__init__(self, editable, addable)
 
     @property
     def table_title(self):

r2/r2/templates/modlist.html

@@ -52,7 +52,7 @@
   %if thing.can_force_add:
     ${add_form(thing.form_title, thing.destination, thing.type, thing.container_name)}
   %endif
-  %if thing.editable:
+  %if thing.addable:
     <%call expr="add_form(thing.invite_form_title, thing.destination, thing.invite_type, thing.container_name, verb=_('invite'))">
       ${error_field("ALREADY_MODERATOR", "name")}
     </%call>

r2/r2/templates/userlist.html

@@ -69,7 +69,7 @@
 </%def>
 
 <div class="${thing._class} usertable">
-  %if thing.editable:
+  %if thing.addable:
     ${add_form(thing.form_title, thing.destination, thing.type, thing.container_name)}
   %endif