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.本数据集为日本历史国立博物馆（National Museum of Japanese History）发布的《日本考古研究报告已发表文献中的碳十四年代数据库》经整理甄选后的英文译本的首次正式发布。 注：本版本为1.1.0版本发布后的修正版本，仅对数据论文中的图1进行了小幅编辑。