class_docstr: Remove implicit tuple -> variable conversion.
  
  >>> import gast as ast
  >>> from pythran import passmanager, backend
  >>> node = ast.parse("def foo(): a=(1,2.) ; i,j = a")
  >>> pm = passmanager.PassManager("test")
  >>> _, node = pm.apply(NormalizeTuples, node)
  >>> print(pm.dump(backend.Python, node))
  def foo():
      a = (1, 2.0)
      i = a[0]
      j = a[1]
code: def visit_Lambda(self, node):
      self.generic_visit(node)
      for i, arg in enumerate(node.args.args):
          renamings = OrderedDict()
          self.traverse_tuples(arg, (), renamings)
          if renamings:
              nname = self.get_new_id()
              node.args.args[i] = ast.Name(
                  nname, ast.Param(), None, None
              )
              node.body = ConvertToTuple(nname, renamings).visit(
                  node.body
              )
      return node
  
imports: from pythran.analyses import Identifiers
  from pythran.passmanager import Transformation
  import gast
  from functools import reduce
  from collections import OrderedDict
  from copy import deepcopy
label_desc: Use image node_id 10 for calling the NormalizeTuples obj's underlying member method code with example usage: obj.visit_Lambda(node) and returns: node