+release 0.17 (??):
+
+ - INTERFACE CHANGE: the callback functions now take an extra argument: the
+ record/element identifier (that is also used as first argument in the
+ *_subscribe_* functions). The extra argument is the first argument.
+
+ - INTERFACE CHANGE: Age values are now parsed: an extra type is added to
+ the types possible in a Gedcom_val: an age_value (see documentation for
+ details). So, instead of GEDCOM_STRING, you now need to use GEDCOM_AGE
+ for age values.
+ As a quick change, you can use the raw_value instead of the parsed_value
+ until you make the real change of using the struct age_value.
+