Changes in version 0.6:

Option '-o, --output' now behaves like '-c, --stdout', but sending the
output unconditionally to a file instead of to standard output. See the new
description of '-o' in the manual. This change is not backwards compatible.
Therefore commands like:
  xlunzip -d -o foo - bar.lz < foo.lz
must now be split into:
  xlunzip -d -o foo - < foo.lz
  xlunzip -d bar.lz
or rewritten as:
  xlunzip -d - bar.lz < foo.lz > foo

In-place decompression of concatenated files should now work for any
combination of files as long as they fit in memory and their total
decompressed size is smaller than LONG_MAX minus a small extra space.

The README file now includes an analysis of the amount of memory required
for in-place decompression.