Return to development
Fill README, add make rules for intermediate files and install to DESTDIR

Also bump the recommended attoconf version
Use the new template mechanism for attoconf
Tweak build system a bit more
Make character loading less slow

This is not the best solution, but it is obvious, correct, and does
indeed change the complexity from O(n²) to O(n lg n).
Fix the trade bug
Release v13.9.27