Wolfpack Empire 4.2.21 released

This release fixes security holes, crashes, hangs and abusable bugs.
Player visible changes include support for UTF-8 encoded Unicode in
human-human communications. Deity visible changes include renaming of
command hidden to peek.

Deities are urged to use this release for new games. Upgrading
mid-game is not supported and expected to result in total disaster.

Client writers, please check out doc/clients-howto and doc/unicode.