Mann-kendall

代码说明：

  魏凤英编著的《现代气候统计诊断预测技术》一书中有关于用Mann-Kendall法检测1900～1990年上海年平均气温序列突变的例子(Wei Fengying compiled the " Diagnostic Statistical prediction of modern climate," a book about the Mann-Kendall detected by 1900 the average temperature in Shanghai in 1990 an example of the mutations)