OpenARC release 0.1.0

Initial public pre-release of OpenARC.

This is the first version being released as a tarball for use by distributions or in live installations. It is up to date and complete with version 9 of the proposed spec. Of particular note:

• This version is intended for formal shakedown use in test or production environments. It has, especially compared to OpenDKIM, only a rudimentary feature set. After some time with field testing, and discovery (and hopefully implementation) of major missing features, it will be ready for a 1.0.0 release.
• There is documentation about use of the filter, but none (yet) about the library. It follows the general model of libopendkim, but there are substantial differences. Full library documentation will be included in 1.0.0.

Gracious thanks to the open source community that has been supporting it during its long early development period.