Make return missions worthwhile

[ethernet]

Currently, once you get solar panels, there's no real reason to do return missions. It's more advantageous to simply repeat experiments and retransmit ad-nauseum until the full pool for that experiment is exhausted.

My suggestion is to tweak how the transmission loss is applied. Instead of X% to the amount of Science gained, make transmitted science treat the cap for that experiment as X% of the full value. This means that only X% of the experiment's pool can actually ever be earned by transmission, locking the remainder away for return missions.

An alternative approach would to make sure a particular experiment in a particular location can only be done once per science part per mission, but it could get difficult to determine exactly what a "mission" is. The approach above has no ambiguities.