<URL: http://bugs.freeciv.org/Ticket/Display.html?id=39595 >
S2_1 is network incompatible with released betas (1-4) Mandatory
capability is required so server/client does not accept connections
from incompatible other end.
Since network compatibility is broken anyway, all the non-mandatory
capabilities should be removed (meaning that code must be changed to
not to require those capabilities from other end)
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