layouts: use termfair layout for terminals

This layout comes from lain collection of layouts. We import it as a
submodule.

rc/tags.lua

@@ -2,6 +2,7 @@
 
 local shifty = loadrc("shifty", "vbe/shifty")
 local keydoc = loadrc("keydoc", "vbe/keydoc")
+local lain = require("lain")
 
 local tagicon = function(icon)
    if screen.count() > 1 then
@@ -30,7 +31,9 @@ shifty.config.tags = {
    },
    xterm = {
       position = 1,
-      layout = awful.layout.suit.fair,
+      layout = lain.layout.termfair,
+      nmaster = math.floor(screen[1].geometry.width / 500),
+      ncol = 1,
       exclusive = true,
       slave = true,
       spawn = config.terminal,

rc/theme.lua

@@ -40,6 +40,8 @@ theme.taglist_squares_unsel = icons .. "/taglist/squarew.png"
 for _, l in pairs(config.layouts) do
    theme["layout_" .. l.name] = icons .. "/layouts/" .. l.name .. ".png"
 end
+local lain_icons = awful.util.getdir("config") .. "/lain/icons/layout/zenburn"
+theme.layout_termfair    = lain_icons .. "/termfair.png"
 
 -- Naughty
 naughty.config.presets.normal.bg = theme.bg_widget