Bisect_ppx 1.0.0

• Redesign HTML reports.
• Put separate points on each clause of or-patterns.
• Put points on applications of |>.
• Eliminate -safe, -fast, -faster modes. All modes now fast and thread-safe.
• Improve integration with other ppx preprocessors.
• Install native ppx rewriter when possible.
• Adjust which points have which kinds.
• Clean up command-line help of bisect-ppx-report.
• Add Ocamlbuild plugin helper and coverage tag.
• New documentation.
• Testing, build, and packaging improvements.