Revert xz, bzip2 compresses better.

pack

@@ -53,7 +53,7 @@ for BRANCH in $BRANCHES; do
 		cd $LCODE-temp
 		$TAR --remove-files -cf ../$LCODE-$BRANCH.tar wesnoth*
 		cd ..
-		$XZ -9 $LCODE-$BRANCH.tar
+		$BZIP -9 $LCODE-$BRANCH.tar
 		echo "New archive created."
 	fi
 	rm -rf $BRANCH-temp

variables

@@ -32,7 +32,7 @@ MSGMERGE=`which msgmerge 2> /dev/null`
 MSGINIT=`which msginit 2> /dev/null`
 ISUTF8=`which isutf8 2> /dev/null`
 TAR=`which tar 2> /dev/null`
-XZ=`which xz 2> /dev/null`
+BZIP=`which bzip2 2> /dev/null`
 DIFF=`which diff 2> /dev/null`
 
 # Colors