M48 Patton series in obat12

[DRG]

I'll put this info in the files to investigate next year. We skip some models as being irrelevant in game terms. I know some would prefer we include every last version of any tank for "accuracy" if it doesn't have any significant changes that would affect game play we skip it which is why the A1's were ignored as were the A2c's. Also affecting when models are available is the ammo ( or gun in the game ) which complicates things further when establishing when units are available and that can eat into the remaining unit slots if I let it so this involves more than just a couple of start or end date changes and I'm too busy with other issues ATM to do any more than copy the info to the list