Adjust per-directory vs global ChangeLog to match current practice.

Adjust per-directory vs global ChangeLog to match current practice.

Spelling fixes.

Add Solaris on 64-bit to list of 'supported' platforms.

List NetBSD/sparc64 as a 'future' platform - there aren't enough users
to make it really supported, but it's good at exposing latent bugs
(e.g router advertisement formatting on BSD, and LSA alignment
issues).

Note explicitly that ospf6d and isisd are in 'testing' rather than
'stable'.  (Feel free to correct - just wanted to get more explicit.)

Add note questioning current relevance of isisd.sf.net - is our repo
the canonical place now?