To be able to use the module as an unprivileged user we need to
adjust certain things:
* only enforce the run user and group if we are root and can
actually change the user
* set owner/group of our files and directories to our own user/group
* place the concat script in a location we can write -> use the
concat dir for that.
The concat warn parameter can now be any string (and needs to include
the appropriate commenting character) and will then override the default
(which still gets printed when warn=>true).
Signed-off-by: martin f. krafft <madduck@madduck.net>
