add snippet to MM code

There you go:

once os      = 1   //ordersize - can be any number depending on account size.
once osa     = os
once kax     = 15  //15
once teilung = 2   //1.5 reducing the ordersize after winning trade
//once zl=2  // 2 Ziellevel. Quadrant wird in zl Teile geteilt, je weniger, desto höher das Ziel
//once mgr=60  // 40  Mindestgröße des Channels
once ff      = 2.0   //2.5 increasing ordersize after losing trade. (for first 2 consecutive losses)
once ff2     = 1.2   //1.2 times the size after the THIRD consecutive LOSS
once ff3     = 1.4   //1.4 times the size after the FOURTH consecutive LOSS
once ff4     = 1.7   //1.7 times the size after the FIFTH consecutive LOSS  (beyond 5 losses, stop increasing)
once maxcon  = 50// defing the maximum ordersize
once losses  = 0

if hour=8 and minute>45 then   // default setting of parameters outside tradingtime
if strategyprofit>sp then  // and if equity reaches maximum again.
os = osa
sp = strategyprofit
endif
start=0
endif

if date<>20161226 and date <>20161227 and  date<>20161230 and hour>8 then // there may be more "bad"-days to be excluded..... not only christmas
if strategyprofit<strategyprofit[1] then // increasing ordersize when losing
losses = losses + 1
IF losses <= 2 then
os = os * ff
elsif losses = 3 then
os = os * ff2
elsif losses = 4 then
os = os * ff3
elsif losses = 5 then
os = os * ff4
endif
//if os>maxcon then
//os=maxcon
//endif
os = min(os,maxcon)
endif
start = 1
endif

if strategyprofit>strategyprofit[1] then // decreasing ordersize when winning
losses = 0
start  = 1
os     = 1 //teilung
//if os<osa then
//os=osa
//endif
os    = max(osa,os)
endif

on those forbidden dates you are preventing losses from being tallied, is that a mistake or is it a desired behaviour?