reinstate word creation and use for strings

so string constants become words, so we can fiddle with them

test/helper.rb

@@ -19,17 +19,6 @@ $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'test'))
 
 require 'salama'
 
-module Register
-  # Functions to generate parfait objects
-  def self.new_word( string )
-    string = string.to_s if string.is_a? Symbol
-    word = Parfait::Word.new( string.length )
-    string.codepoints.each_with_index do |code , index |
-      word.set_char(index + 1 , code)
-    end
-    word
-  end
-end
 
 class Ignored
   def == other