Calculation of file path may be performed in two different places -
first is the original location of the config file, second is on copied
one. Adding new option WRAPPER will take the same role as $CONFIG,
except it will be only parsed on copied configuration file.
An alternative would be to check existence in both places, but I'd like
to have it explicit.
This changeset fixes tar behavior on creating archive, like:
tar cf foo.tar .
which include also archive file itself, so that tar reports an error
`file changed as we read it` during appending archive file to itself.
This changest is fixing that by replacing dot with list of items to be
added to the archive (similar as in RarArchive.create).
