The program_invocation_short_name portability code is copied
from util-linux project almost as is.
Reported-by: Roar Pettersen <rope1968@gmail.com>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
The eprintf removed and replaced with err & warn. Option parsing
no longer tries to find missing optargs, which are getopts should
notice. Few complier warnings got to be removed as well. Finally
the commments will no longer exceed standard terminal width.
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
