+Sep 28, 2002 - Patch 0.2.3
+--------------------------
+
+ - Bugfix: In configuration::find_parameter(), check if the parameter node exists
+ before retrieving its contents.
+ - New feature: substring selection by regular expression, with
+ substring String::operator()(const regex &r);
+ - Bugfix: Reading a String object from an istream now checks for
+ end-of-file.
+ - Bugfix: conversion of an empty string to a date or hour object
+ now makes the values of such an object 0 (null) instead of giving
+ a segmentation fault.
+ - The class UTC combines the date and hour classes. The most basic
+ functions of the UTC class are now implemented.
+ These include constructors and conversion to and from String objects.
+ - New functions: date::proper(), hour::proper() and UTC::proper().
+ Return true if the object holds a proper clock time and/or calendar
+ date; false if at least one value is out of range.
+