app: more tweaks to local/archive ls-laR.gz comparison
app: fixed #29: all files tagged as "IS_UNKNOWN"

- File::stat objects can't use the '-X' tests until Perl 5.12.1, so
  the file test on the 'stat' object was not working at all, causing
  all files to be tagged as "IS_UNKNOWN"
- Fixed check for syncing dotfiles