Research: Fixing the trait bugs

[player1]

I doubt that you can get negative bodyguards. It's just that that bodyguard unit would probably not get reinforced ever.

[player1]

Does anybody remember the old bug, when gaining anti-trait would reset trait value to zero, regardless how good trait was?

Well, I found out the solution.

The thing is that traits that have "no going back level" aren't affected.
So soulution is to add "virtual" no going back level to all traits. Since we really don't want to have all traits with real no gonig back levels, no going back level should be one level higher then highest level of the trait (impossible to reach). So, for example, if GoodCommander has 5 levels, its no going back level should be made 6.