clean up booting

many machine boot became obsolete
or just neede parfait to boot
actual linker functionality pending

test/mom/instruction/test_slot_load1.rb

@@ -4,7 +4,7 @@ module Mom
   class TestSlotLoad1 < MiniTest::Test
 
     def setup
-      Risc.machine.boot
+      Parfait.boot!
       @load = SlotLoad.new( [:message, :caller] , [:message,:type] )
       @compiler = CompilerMock.new
       @instruction = @load.to_risc(@compiler)