Merge branch 'next'

* next:
  xml, add new api 9.68 fields
  xml, handle new field orderComboLegs (api 9.67)
  xml, add xml converter for OrderComboLeg (api 9.67)
  xml, add some (not yet all) of the new ib api 9.67 fields
  cleanup, more generic TagValueList xml converters
  cleanup, for loop cosmetics
  cleanup, from_xml funcs only check XML_ELEMENT_NODE children
  cleanup, "else if" xml children
  from_xml funcs don't re-use member pointers
  from_xml funcs don't inititialize the structs at all
  cleanup, always initialize complete struct when getting from xml
update ChangeLog