[Freeciv-Dev] (PR#11299) 2.0 and 2.0.99-devel aren't compatible

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=11299 >

S2_0 and the development branch aren't really network-compatible 
anymore.  The main problem seems to be with the removal of 
unittype_exists() in the 2.0.99.  Connect to an old server with a new 
client, and you'll see all the "non-existant" units.  Try to open the 
units dialog and the client will crash.

This could probably be fixed by removing the nonexistant units from 
S2_0.  But it would be better just to break network compatibility with a 
new manditory capability.

-jason