改良boll，三轨看不到细节，改成五轨

BOLL:MA(CLOSE,N);
UUB:BOLL+2*STD(CLOSE,N);
UB:BOLL+1*STD(CLOSE,N);
LB:BOLL-1*STD(CLOSE,N);
LLB:BOLL-2*STD(CLOSE,N);