[server] minor comment typo fix
Updated authorship and copyright information

This commit updates all authorship and copyright information to include a
standard header that references the AUTHORS and CREDITS file. This standard
header was written by the Debian legal team at the request of Franck Joncourt.
[test suite] minor --help update to include missed options
[test suite] establish new test.log file in --list mode
[client] bug fix to convert UDP length header field to network byte order in UDP raw mode
[client] bug fix to set non-zero random source port for UDP raw SPA mode
started on 2.6.1 ChangeLog entries
fix header non-ascii chars, and introduce test suite support for detecting this in source files