Changes in version 1.1:

The new options "--bz2", "--gz", "--lz" and "--xz" have been added to
all utilities.

Zutils now provides the runtime configuration file "zutilsrc", which
allows the user change the compressor to be used for each format.

The checking of the exit status of compressors has been improved.

The use of "decompressed" and "uncompressed" in the documentation has
been revised.
