Add simulation test cases

[johnwarden]

• Ground truth changes
• Reputation
• Bridging
• Brigading
• Common bot attacks
• Destroying more value than you create
• Attention/Contribution Points
• More complex trees
• Two direct replies that: cancel each other out, reinforce each other, only have an effect when combined, etc.
• Duplicates, but only one has counter argument
• Authorship which influences reputation, how reliable is the information you post
• Simulations with small numbers of people
• Test case: run away of endless rebuttal deeper and deeper in the tree should self-balance
• Same with run-away horizontally