Gain experience based on each citation/paper/etc

[earlbellinger]

Currently, experience for your Scholar Level comes from completing full achievements. This could perhaps be improved by gaining experience for each citation, etc. For example, a citation could be worth 1 point, a paper worth 100 points, a first-author paper worth double, etc. Reasonable levels would need to be set based off of that, perhaps according to hard data (i.e. by looking at a number of scholar profiles and figuring out experience thresholds based on those).