improved system stats

[holtzermann17]

http://planetmath.org/overview has some basic stats. There are some others we might want:

• Number of entries added ✓
• Number of entries edited
• Number of corrections posted ✓
• Number of corrections filled
• Number of questions asked ✓
• Number of questions answered ✓
• Number of forum posts ✓
• Number of new users ✓
• Amount of patronage donated
• Number of people donating
• Number of hits
  • this should be broken down so that, for instance,
    we don't get fooled when our hits go up because a search engine decides
    to index twice a day instead of once a day in order to provide more
    timely results.
• Search engine ranking
  • this can be measured by collecting a sample
    set of queries related to math, inputing them to various engines,
    and averaging the raniking of those terms. I would also be good to
    look at the breakdown here to see, for instance, how specialized
    queries compare with general ones.