Fix distclean for deb builds

Deb build doc updates
Checklist updates
Deb 8 changelog

apps/susidns/src/build.xml

@@ -182,6 +182,7 @@
       </delete>
       <delete dir="${bin}" />
       <delete dir="${tmp}" />
+      <delete dir="build" />
     </target>
     <target name="distclean" depends="clean" />
 </project>

apps/susimail/build.xml

@@ -150,6 +150,7 @@
     <target name="clean">
     	<delete dir="src/WEB-INF/classes"/>
     	<delete file="susimail.war"/>
+    	<delete dir="build"/>
     </target>
     <target name="cleandep" depends="clean" />
     <target name="distclean" depends="clean" />