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ICU-2296 update readme

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Markus Scherer 2002-10-16 00:07:09 +00:00
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"http://oss.software.ibm.com/icu/download/2.2/">ICU 2.2 download
page</a>.</p>
<h3>UnicodeString assignments</h3>
<p>ICU 2.4 changes the behavior of the <code>UnicodeString</code> assignment operator
and copy constructor for where the source string is a readonly alias.
For such strings, the copy used to also be a readonly alias to the same buffer,
but that was seen as too dangerous (see <a href="http://www.jtcsv.com/cgibin/icu-bugs?findid=2296">Jitterbug 2296</a>).
The new <code>fastCopyFrom()</code> member function provides the old
assignment behavior.
It can be used explicitly when it is known to be safe to maintain readonly aliases
instead of cloning the buffer.
For more information about string aliasing and other <code>UnicodeString</code> storage models
see the <a href="http://oss.software.ibm.com/icu/userguide/strings.html">User Guide Strings chapter</a>.</p>
<h3>Unicode-handling macros (utf*.h)</h3>
<p>The macros in <code>source/common/unicode/utf*.h</code> have been