ORC v1.7.10, v1.8.6, and v1.9.2

[Dongjoon Hyun]

To All.

As William mentioned, it's time for next releases.

I'm preparing the releases (1.7.10, 1.8.6, 1.9.2) now for next Monday.

Please let me know if you need more backports.

I believe we can finish the releases before Thanksgiving. :)

Dongjoon.