1.7.16 up for testing/signing

[Ben Reser]

The 1.7.16 release artifacts are now available for testing/signing.
Please get the tarballs from
  https://dist.apache.org/repos/dist/dev/subversion
and add your signatures there.  I plan to try and release on February
26th so please try and get your votes/signatures in place by February 24th.