The financial chattering class has recently added a new buzz phrase to its already overstocked lexicon: “commodity super cycle.”   Ruchir Sharma head of emerging markets equities at Morgan Stanley (NYSE:MS) Asset Management helped popularize this concept when raw materials prices were being pummeled last spring. He peered 200 years into the past and divined a persistent pattern of decade-long rises in commodities values followed by 20-year periods of decline.   The boisterous up decade of the 2000s (the little glitch of 2008 excepted) has now ended as its driving engine China shifts to less resource-intensive growth and its ...