renames SelfSlot to SelfsSlot

in the hope to make a little more distinction

lib/bosl/compiler/field_access.rb

@@ -12,7 +12,7 @@ module Bosl
         index = @clazz.object_layout.variable_index(field_name)
         raise "field access, but no such field:#{field_name} for class #{@clazz.name}" unless index
         value = Virtual::Return.new(:int)
-        @method.source.add_code Virtual::Set.new( Virtual::SelfSlot.new(index, :int ) , value )
+        @method.source.add_code Virtual::Set.new( Virtual::SelfsSlot.new(index, :int ) , value )
       when :message
         #message Slot
         raise "message not yet"