fix etherpad-to-optim (output.hdoc -> pad.hdoc)

etherpad_to_optim/etherpad_to_optim.ant

@@ -35,7 +35,7 @@
                 <include name="*.hdoc"/>
             </fileset>
         </delete>
-        <copy file="${eth_out}/output.hdoc" todir="${opti_in}"/>
+        <copy file="${eth_out}/pad.hdoc" todir="${opti_in}"/>
         <exec dir="../hdoc_to_optim" executable="run.sh"/>
         <copy file="${opti_out}/*.scar" todir="output"/>        
     </target>
@@ -46,7 +46,7 @@
                 <include name="*.hdoc"/>
             </fileset>
         </delete>
-        <copy file="${eth_out}/output.hdoc" todir="${opti_in}"/>
+        <copy file="${eth_out}/pad.hdoc" todir="${opti_in}"/>
         <exec dir="../hdoc_to_optim" executable="run.bat"/>
         <mkdir dir="output"/>
         <copy file="${opti_out}/result.scar" todir="output"/>