Alert users when version conflicts with initial version

[nscrutable]

It's my educated guess that this bug is caused by PBEM games with conflicting versions (04b and 05). An alert when the user's version conflicts with the initial version of the game would improve error handling immensely: instead of getting an unrelated crash several turns in, the user finds the root cause in the first round!

[zgrssd]

+1

This will also cut down on reporting issues.

And I am not even playing the game in Multiplayer.