[Opale2Optim] Modified ant file in order to clean at the beginning

opale_to_hdoc/opale_to_hdoc.ant

@@ -15,6 +15,7 @@
 
 	<!-- Beginning -->
 	<target name="convert">
+		<antcall target="clean" />
 		<antcall target="unzip_scar" />	  	
 		<antcall target="check_source_xml" />
 		<antcall target="hdoc_structure" />
@@ -24,9 +25,14 @@
 		<antcall target="zip" />
 		<antcall target="clean" />
 	</target>
-		
+	
 	<!-- Clean : delete old files -->
 	<target name="clean">
+		<!-- create folders (to be sure) -->
+		<mkdir dir="${UnzipSourcePath}"/>
+		<mkdir dir="${TmpPath}"/>
+		<mkdir dir="${HdocPath}"/>
+		<touch file="get_ressources.ant"/>
 		<!-- delete folders -->
 		<delete dir="${UnzipSourcePath}"/>
 		<delete dir="${TmpPath}"/>