Learning should increase Skill (xp) gain, not attributes

[Malafar]

With the new skill system, I think the Learning stat should be reworked to improve the rate that skill points are earned, rather than how quickly attributes are gained. Besides making intuitive sense (Skills can be seen as job learning, while attributes like athletics or strength are trained, not learned), this helps a lot when it comes to attribute balance. Right now the opinion I see most often is that learning trumps virtually all other attributes, especially early game. Changing this to increase skill point generation keeps it valuable, particularly for dupes that need extensive training (astronauts) but makes it less essential for dupes that specialize in more linear job paths.