updated SMP2 core (A3): v2.17

[kasson]

We have released an updated version of the A3 core used to run SMP2 work units. The current release is now 2.17. Right now one of our SMP2 servers is requiring the new core; your client should auto-download the core next time you get work from that server.

Please do *not* update your cores mid-WU. The checkpoint format is different, and your work unit will start over from the beginning.

Thanks for your support of the project!