MACD另一种图形，有效买点之前要先确认MACD由上往下穿0点
DIFF : EMA(CLOSE,SHORT) - EMA(CLOSE,LONG);
DEA : EMA(DIFF,M);
MACD : 2*(DIFF-DEA);
SIG : EMA(MACD,M);
Zero : 0;
DRAWICON(CROSS(MACD,SIG),MACD,1);
DRAWICON(CROSS(SIG,MACD),SIG,2);
