Description: DDB tileset release 2.1.0 for Freeciv 2.1

Credits: Edited by Daniel Markstedt, based on work by Daniel Bennet,
incorporating work by Arturo Espinosa-Aldama

To regenerate the flags, get the sqrflags tarball from contrib/graphics/flagsets
and untar to the flags subdirectory of this tileset, then run the convert_png
script.