Changes in version 0.18:

The new option '--check-lib', which compares the version of lzlib used to
compile tarlz with the version actually being used, has been added.

Multi-threaded '-x, --extract' has been implemented. See chapters 'Internal
structure of tarlz' and 'Limitations of parallel tar decoding' in the manual
for details.

The header <sys/sysmacros.h> is now not #included when compiling on OS2.

The new section 'Limitations of multi-threaded extraction' has been added to
the manual.
