Improving game logging

[Diziet Sma]

A recent case of missed opportunity here reminded me of something I'd been meaning to suggest for a while.

There are regular instances where logs recording difficult-to-reproduce errors aren't available, because the player has inadvertently wiped out the log by having re-run the game 2 or more times since the problem manifested. Indeed, I'm sure most of us here have at some point wished we had access to a logfile that no longer exists. I've even considered writing a bash-script that would auto-run just prior to launching Oolite that would back up both currently existing logs to a sub-folder. In fact, I think I will do so, to address the shortcomings of the logging on 1.76.1.

Please consider extending the log-rotation system so that (say) the last dozen or even 20 game-logs are retained, instead of the most recent two logs only.

[Cmd. Cheyd]

For release builds, I think 2 is fine. But for the development builds, I can see the merit.

[Diziet Sma]

I'd up it even for release builds.. it would make tracking down OXP bugs easier.