Updated the way that reviews work, also updated PDF version

The REVIEW table contains the reviews that exist. The type denotes what
type of review it is (peer review, industry sponsor review, etc).
The REVIEW_QUESTION table contains review questions, their type (1-10,
text, true-false, etc), and the REVIEW_QUESTIONS table links questions
to their review.
The REVIEW_ANSWER table stores answers to individual questions that are
part of a review. Reviewer username will be null when a person that is
not a user in the system completes a review (such as industry people or
academic advisors without an account)