New races-maintenance reduction

[Suicide Junkie]

Maintenance reduction is just too valuable. For about a thousand points, you can double your maximum sustainable fleet size.

IMO, Maintenance reduction needs to have more price levels, and cost much more for the higher reductions.

I'm also thinking of starting the maintenance at 100%, so +5% maintenance reduction gives you 95% maintenance. The resulting price can then be divided by 4 to get Standard SE4 maintenance of 25%, or in this case (+5%), 23.75%