change title and point to raw version of vincent's topology pgconf 2012 talk

git-svn-id: http://svn.osgeo.org/postgis/trunk@13148 b70326c6-7e19-0410-871a-916f4a2858ee

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        <title>Topology</title>
        <para>The PostGIS Topology types and functions are used to manage topological objects such as faces, edges and nodes. </para>
        <para>Sandro Santilli's presentation at PostGIS Day Paris 2011  conference gives a good synopsis of PostGIS Topology and where it is headed <ulink url="http://strk.keybit.net/projects/postgis/Paris2011_TopologyWithPostGIS_2_0.pdf">Topology with PostGIS 2.0 slide deck</ulink>.</para>
-       <para>Vincent Picavet provides a good synopsis and overview of what is Topology, how is it used, and various FOSS4G tools that support it in <ulink url="https://github.com/Oslandia/presentations/blob/master/pgconf_eu_2012/pgconfeu2012_vincent_picavet_postgis_topology.pdf">State of the art of FOSS4G for topology and network analysis</ulink>.</para>
+       <para>Vincent Picavet provides a good synopsis and overview of what is Topology, how is it used, and various FOSS4G tools that support it in <ulink url="https://github.com/Oslandia/presentations/blob/master/pgconf_eu_2012/pgconfeu2012_vincent_picavet_postgis_topology.pdf?raw=true">PostGIS Topology PGConf EU 2012</ulink>.</para>
        <para>An example of a topologically based GIS database is the <ulink url="http://www.census.gov/geo/www/tiger/overview.html">US Census Topologically Integrated Geographic Encoding and Reference System (TIGER)</ulink> database. If you want to experiment with PostGIS topology and need some data, check out <xref linkend="Topology_Load_Tiger" />.</para>
        <para>The PostGIS topology module has existed in prior versions of PostGIS but was never part of the Official PostGIS documentation.
            In PostGIS 2.0.0 major cleanup is going on to remove use of all deprecated functions in it, fix known usability issues, better document the features and functions, add new functions, and enhance to closer conform to SQL-MM standards.</para>