Better TLS checks
Fix a bug in Miller-Rabin primality testing introduced in 1.8.3
where we chose a single random nonce and tested it repeatedly, rather
than choosing new nonces each time. Reported by Jeff Marrison.

Also remove a pointless comparison (also pointed out by Jeff) and add
an initial test using a witness of 2.
Add 1.10.8 release notes
Update release note pointers