remove unused methods

and a whole lot more index fixes

lib/risc/instructions/getter.rb

@@ -22,7 +22,7 @@ module Risc
       @array = array
       @index = index
       @register = register
-      raise "index 0 " if index == 0
+      raise "index #{index}" if index.is_a?(Numeric) and index < 0
       raise "Not integer or reg #{index}" unless index.is_a?(Numeric) or RiscValue.look_like_reg(index)
       raise "Not register #{register}" unless RiscValue.look_like_reg(register)
       raise "Not register #{array}" unless RiscValue.look_like_reg(array)

lib/risc/instructions/reg_to_slot.rb

@@ -18,14 +18,9 @@ module Risc
   #     (which are precisely the symbols :message or :new_message. or a register)
   # index resolves with resolve_to_index.
   def self.reg_to_slot( source , from_reg , to , index )
-    no_rec = index != :receiver
-    puts "FROM #{from_reg}"
-    puts "TO #{to}"
-    puts "IN #{index}"
     from = resolve_to_register from_reg
     index = resolve_to_index( to , index)
     to = resolve_to_register to
-#    raise "HALLO " if index == 2 and no_rec
     RegToSlot.new( source, from , to , index)
   end