Changes in version 1.4:

The options "-f, --force", "-F, --recompress", "-k, --keep", and
"-o, --output", have been ported from clzip.

Pdlzip now accepts more than one file in the command line.

Decompression time has been reduced by 5%.

The dependence of "-t" on the existence of "/dev/null" has been removed.

The value returned by "-d" and "-t" in case of data error has been fixed.

Information shown at verbosity levels 2 and 3 has been changed.

Option "-n, --threads" is now accepted and ignored for compatibility
with plzip.

"configure" now accepts options with a separate argument.

Configure option "--datadir" has been renamed to "--datarootdir" to
follow GNU Standards.

The target "install-as-lzip" has been added to the Makefile.

The target "install-bin" has been added to the Makefile.
