Changes in version 1.10:

The license has been changed to "GPL version 2 or later with link
exception".

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Rationale for the license change.

I have recently been shocked to know that it is apparently not legal to
use Arg_parser in GPLv2 programs. Linking those programs with Arg_parser
violates the GPLv2. But linking proprietary programs with Arg_parser is
fine and legal!

This problem is not caused by any fault in Arg_parser's link exception;
the LGPLv3 has the same problem. See for example
http://nmav.gnutls.org/2013/03/the-perils-of-lgplv3.html

Of course it was never my intention to prevent GPLv2 programs from using
Arg_parser. I apologize for any inconveniences my oversight may have
caused to distributions, GPLv2 software projects, and users in general.
