Updated treefarm to new logger syntax

jlib/log.lua

@@ -15,7 +15,6 @@ local Logger = {
     prefixes = { "CRIT", "ERROR", "WARN", "INFO", "DEBUG" },
     filename = nil
 }
-Logger.__index = Logger
 
 
 -- Return a new logger 'object'.
@@ -34,11 +33,7 @@ Logger.__index = Logger
 function Logger:new(o)
     o = o or {}
     setmetatable(o, self)
-    -- Fill in default values where needed
-    -- TODO find out if this is needed or not
-    -- for k, v in pairs(Logger) do
-    --     o[k] = o[k] or Logger[k]
-    -- end
+    self.__index = self
 
     -- Open file handler
     if o.filename then