Remove the 'clone_on' property

This feature never fully worked and cannot work. It is *impossible*
to implement it with the current Awesome core design.

While I know it is often requested, I cannot and will not support
it any longer. This belong to the Awesome API, not Tyrannical.

README.md

@@ -172,8 +172,6 @@ tyrannical.tags = {
         init        = true,
         exclusive   = true,
         screen      = 1,
-        clone_on    = 2, -- Create a single instance of this tag on screen 1, but also show it on screen 2
-                         -- The tag can be used on both screen, but only one at once
         layout      = awful.layout.suit.max                          ,
         class ={ 
             "Kate", "KDevelop", "Codeblocks", "Code::Blocks" , "DDD", "kate4"}
@@ -229,7 +227,6 @@ Then edit this section to fit your needs.
 | ------------------------- | ---------------------------------------------------- |:----------------:|
 | **class**                 | Match these classes to this tag                      | array of string  |
 | **instance**              | Match these instances to this tag. ★                 | array of string  |
-| **clone_on**              | Create a clone on screen(s)                          | number or array  |
 | **exclusive**             | Allow only client from the "class" attributes        | boolean          |
 | **exec_once**             | Execute when the tag is first selected               | string (command) |
 | **force_screen**          | Force a screen                                       | boolean          |

init.lua

@@ -229,10 +229,6 @@ awful.tag.add,awful.tag._setscreen,awful.tag._viewonly = function(tag,props)
     props.screen,props.instances = props.screen or capi.mouse.screen,props.instances or setmetatable({}, { __mode = 'v' })
     props.mwfact,props.layout = props.mwfact or settings.mwfact,props.layout or settings.default_layout or awful.layout.max
     local t = awful.tag._add(tag,props)
-    if prop(t,"clone_on") and prop(t,"clone_on") ~= t.screen then
-        local t3 = awful.tag._add(tag,{screen = prop(t,"clone_on"), clone_of = t,icon=awful.tag.geticon(t)})
-        --TODO prevent clients from being added to the clone
-    end
     fallbacks[#fallbacks+1] = props.fallback and t or nil
     t:connect_signal("property::selected", function(t) on_selected_change(t,props or {}) end)
     t.selected = props.selected or false
@@ -244,10 +240,6 @@ awful.tag.viewonly = function(t)
     if not t then return end
     if not awful.tag.getscreen(t) then awful.tag.setscreen(capi.mouse.screen) end
     awful.tag._viewonly(t)
-    if prop(t,"clone_of") then
-        awful.tag.swap(t,prop(t,"clone_of"))
-        awful.tag.viewonly(prop(t,"clone_of"))
-    end
 end
 
 capi.tag.connect_signal("property::fallback",function(t)