MINYANVILLE ORIGINAL On Friday stocks in China enjoyed their biggest jump since October 2009. The Shanghai Composite Index (SHA:000001) soared 4.3% to close at 2 150.63 points with trading volume that was more than double the 30-day average.   The rally was in part sparked by robust Chinese manufacturing data with the December preliminary reading for the HSBC flash purchasing managers’ index rising to 50.9 surpassing the consensus estimate of 50.8 and the final reading of 50.5 for November.   “It looks like institutional investors are re-entering the market and they have to increase their stock positions now in ...