fix a whole bunch of vool to_mom

All but those requiring boot functions

lib/mom/instruction/return_jump.rb

@@ -7,6 +7,7 @@ module Mom
   #
   class ReturnJump < Instruction
 
+    # the jump quite simple resolves to an uncondition risc Branch
     def to_risc(compiler)
       compiler.add_code Risc::Branch.new(self , compiler.return_label)
     end