Added a source tarball containing the Python client code

--
Imported using git-svn from
https://dev.csi.cam.ac.uk/svn/lookup/trunk@19

build.xml

@@ -109,10 +109,24 @@
         </exec>
     </target>
 
+    <!-- =================================
+          target: Pyhton src-tarball
+         ================================= -->
+    <target name="python-src-tarball" depends="python-autogen"
+            description="--> Build a tar.bz2 of the Python sources">
+        <tar destfile="downloads/python/ibis-python-client-api-${api.version}-src.tar.bz2"
+             compression="bzip2">
+            <tarfileset prefix="ibis-python-client-api-${api.version}" dir="src/python"/>
+            <tarfileset prefix="ibis-python-client-api-${api.version}" file="src/application.wadl"/>
+            <tarfileset prefix="ibis-python-client-api-${api.version}" file="src/generate-client-methods.py"/>
+            <tarfileset prefix="ibis-python-client-api-${api.version}" file="lgpl.txt"/>
+        </tar>
+    </target>
+
     <!-- =================================
           target: Python all
          ================================= -->
-    <target name="python-all" depends="python-autogen"
+    <target name="python-all" depends="python-src-tarball"
             description="--> Build everything for the Python client API"/>
 
     <!-- =================================