Why upgrade? I'm not a lawyer, but here's my take on the differences
to version 2:
* Software patents: better protection against abuse of patents to
prevent users from exercising the rights under the GPL. I doubt
we'll get hit with a patent suit, but it's a good move just on
general principles.
* License compatibility: compatible with more free licenses, i.e. can
"steal" more free software for use in Empire. I don't expect to steal
much, but it's nice to have the option.
* Definition of "source code": modernization of some details for today's
networked world, to make it easier to distribute the software. Not
really relevant to us now, as we normally distribute full source code.
* Tivoization: this is about putting GPL-licensed software in hardware,
then make the hardware refuse to run modified software. "Neat" trick
to effectively deny its users their rights under the GPL. Abuse was
"pioneered" by TiVo (popular digital video recorders). GPLv3 forbids
it. Unlikely to become a problem for us.
* Internationalization: more careful wording, to harden the license
outside the US. The lawyers tell us it better be done that way.
* License violations: friendlier way to deal with license violations.
This has come out of past experience enforcing the GPL.
* Additional permissions: Probably not relevant to us.
Also include myself in the list of principal authors.
MAPWIDTH(x) was (x+2)/2 - 1 too small. Affected were path and route,
which use MAPWIDTH(3) to size their map buffer: they clobber map rows'
terminating zero when the map spans the whole world in x. rout() has
a cheesy work-around for that since Chainsaw 2. path() doesn't, and
duly breaks.
The function that gave its name to this file is long gone, the file's
description is bogus, and it contains just one definition. Move that
to ../subs/border.c, and delete the file.
other. Ensure headers in include/ can be included in any order
(except for econfig-spec.h, which is special). New header types.h to
help avoid inclusion cycles. Sort include directives. Remove some
superflous includes.
Modify nmap command to allow mapping around a nuke.
Add new command nbmap for bmapping around a nuke.
Add a new mapping flag 'n' for adding nukes to a map.
Correct syntax description for pmap, pbmap, lmap and lbmap
in player_coms[].
