Replays broken.

[mongus]

Replays from old versions of spring are no longer working unless you play them in the original client.
playing then results in wierdness and a huge test.sdf file. (16MB +, .41 replay)!!
or extrange messages and non finished buildings (.50b2)

In the .sdf files headers there is no engine version reference.
This can be handy for replay compatibility. (mode?).

[Min3mat]

OK from now on i'll put that in my reps i have in the most recent. As i'm the only one who seems to be doing reps this should fix the problem