ercrema/japan_c14db: Curated Database of Radiocarbon Dates from Published in Japanese Archaeological Research Reports

This is the first official release of the curated English translation of the "Database of Radiocarbon Dates from Published in Japanese Archaeological Research Reports" published by the National Museum of Japanese History. NOTE: This is a post-release correction of 1.1.0 with a minor edit for Figure 1 in the data paper.