Things to do for fixed PR

[MxmUrw]

• Describe how field size, fixed point bits, vector length relate
• Improve comments (delete slash-lines, better text)
• Remove panics/unwraps
• cargo fmt, rustfmt, clippy
• comments lines are 80 chars
• docucomment lines are 100 chars
• encode_measurement: merge first iteration over vector entries with second, remove max-check because subroutine already does it
• describe that we actually only allow norms < 1 (consider mitigations?)
• write a huge block comment explaining what's going on
• test: vector with too-big norm, vector with norm that differs from claim, non-zero-one-vector, some succeeding vectors using positive and negative numbers
• questions to ask:
  • what to do about the tests (from sum) which expect failures in prio3
  • is there an explanation for the "verifier_len" field?
  • Is making flp_validity_test crate public the correct approach for using it in multiple files?
• rename num_clients to num_shares in validation function (parallel and not parallel version of type)