[freeciv-data] civ2-freeciv ruleset converter

I just uploaded "converter.zip" to incoming.  It's a (messy) perl program that reads in a Civilization 2 modpack's rules.txt (from the current directory) and outputs all the buildings, technologies, terrain, and units in the file.  Also included is a "units.spec" file for use with civ2gfx to load the graphics for a "Civilization 2 Fantastic Worlds" modpack.

This program hasn't been completely tested, but it should work relatively well.  Unfortunately, Civ2 and Freeciv have some incompatabilities in their ruleset files that are hard to reconcile.  Civ2 has nothing like a unit's role, so I just made assumptions that made sense.  I wasn't sure how to tell of a unit was a horse unit, so I just made an educated guess.  The worst problem is that units are obsoleted by technologies in Civ2, but by other units in Freeciv.  I can work around this by finding a unit thats prerequisite technology is the one that obsoletes the current unit, but sometimes units like that don't exist.

Any comments?