[Freeciv-Dev] (PR#8312) request: placeholder packet numbers

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=8312 >

The delta packet numbers in packet.def aren't set "in stone" until 1.15,
right?

So I suggest placing some unused packet numbers in between packet
groups, for future use.  This will help keep the packet numbers better
organized in case of inserts.

However, it would mean keeping track of all unused packet numbers
instead of only the last used packet number.

-James Canete