Update URLs to a couple of external projects

doc/src/sgml/external-projects.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/external-projects.sgml,v 1.16 2007/05/03 15:47:48 alvherre Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/external-projects.sgml,v 1.17 2007/10/16 12:14:33 mha Exp $ -->
 
  <appendix id="external-projects">
   <title>External Projects</title>
@@ -106,7 +106,7 @@
       <entry>libpqxx</entry>
       <entry>C++</entry>
       <entry>New-style C++ interface</entry>
-      <entry><ulink url="http://thaiopensource.org/development/libpqxx/">http://thaiopensource.org/development/libpqxx/</ulink></entry>
+      <entry><ulink url="http://pqxx.tk/">http://pqxx.tk/</ulink></entry>
      </row>
 
      <row>
@@ -120,7 +120,7 @@
       <entry>Npgsql</entry>
       <entry>.NET</entry>
       <entry>.NET data provider</entry>
-      <entry><ulink url="http://pgfoundry.org/projects/npgsql/">http://pgfoundry.org/projects/npgsql/</ulink></entry>
+      <entry><ulink url="http://npgsql.projects.postgresql.org/">http://npgsql.projects.postgresql.org/</ulink></entry>
      </row>
 
      <row>
@@ -141,7 +141,7 @@
       <entry>psqlODBC</entry>
       <entry>ODBC</entry>
       <entry>The most commonly-used ODBC driver</entry>
-      <entry><ulink url="http://odbc.postgresql.org/">http://odbc.postgresql.org/</ulink></entry>
+      <entry><ulink url="http://psqlodbc.projects.postgresql.org/">http://psqlodbc.projects.postgresql.org/</ulink></entry>
      </row>
 
      <row>