Bump document version to 1.0; remove pystone paragraph

Doc/whatsnew/whatsnew25.tex

@@ -5,7 +5,7 @@
 % Fix XXX comments
 
 \title{What's New in Python 2.5}
-\release{0.9}
+\release{1.0}
 \author{A.M. Kuchling}
 \authoraddress{\email{amk@amk.ca}}
 
@@ -1334,9 +1334,6 @@ they exist or not so that the interpreter makes fewer
 
 \end{itemize}
 
-The net result of the 2.5 optimizations is that Python 2.5 runs the
-pystone benchmark around XXX\% faster than Python 2.4.
-
 
 %======================================================================
 \section{New, Improved, and Removed Modules\label{modules}}