Summary
- Resolved codegen problem with uniformity for formal Laurent series
- Formal Laurent series and overhaul of Formal power series (due to Jeremy Sylvestre)
- Exponentiation by squaring, fast modular exponentiation
- more thorough File.set_executable, notably for Windows;
- added executable flag for exports; clarified signature;
- clarified URL -- avoid odd certificate problem with api.media.atlassian.com;
- back to stable polyml-5.7.1-8 for now;
- More material for HOL-Number_Theory: ord, Carmichael's function, primitive roots