Cleanup sax templates. Parser can use handler methods or pure template methods, and Rfm objects will still be built correctly.
Changed @tag_translator to a proc to be called by Cursor#transform. All tags are now downcased before being parsed. All sax templates should now use downcased tag names.
Fixed layout_meta & field_meta issues. All specs passing. All Rfm objects should be correct now.
Fixed bug in field_control#value_list.
Hiding debugging code in some specs.