Teach diffall to handle working copy changes without using tar

The 'tar' utility is not available on all platforms (some only support 'gnutar'). An earlier commit created a work-around for this problem, but a better solution is to eliminate the use of 'tar' completely. Signed-off-by: Tim Henigan <tim.henigan@gmail.com>

Author: thenigan

git-diffall

@@ -202,10 +202,14 @@ then
 fi
 done < "$tmp/filelist"
 else
-# Mac users have gnutar rather than tar
-(tar --ignore-failed-read -c -T "$tmp/filelist" | (cd "$tmp/$right_dir" && tar -x)) || {
-gnutar --ignore-failed-read -c -T "$tmp/filelist" | (cd "$tmp/$right_dir" && gnutar -x)
-}
+while read name
+do
+if test -e "$name"
+then
+mkdir -p "$tmp/$right_dir/$(dirname "$name")"
+cp "$name" "$tmp/$right_dir"
+fi
+done < "$tmp/filelist"
 fi
 
 # Populate the tmp/left_dir directory with the files to be compared