Wolfpack Empire 4.2.16 released

This is a `brown paper bag' release. A bug `fix' in 4.2.15 broke sector production when part of the work is used for sector construction.

Deities are urged to use this release for new games. Upgrading mid-game is normally not supported, but upgrading from 4.2.15 to 4.2.16 is.

There is no separate client release 4.2.16, as the client did not change since 4.2.14.