beta3 version of the tarballs

[[Imported from SVN: r733]]

configure.ac

 #! /bin/bash
 # $Id$
 # Process this file with autoconf to produce a configure script.
-AC_INIT(dune-istl, 1.0beta2, dune@dune-project.org)
+AC_INIT(dune-istl, 1.0beta3, dune@dune-project.org)
 AM_INIT_AUTOMAKE
 AC_CONFIG_SRCDIR([istl/allocator.hh])
 AM_CONFIG_HEADER([config.h])