chg: made histogram.ctp a bit more readable
chg: made histogram.ctp a bit more readable

Rafiot/MISP,devnull-/MISP,Rafiot/MISP,MISP/MISP,MISP/MISP,cristianbell/MISP,devnull-/MISP,FIRSTdotorg/MISP,TheDr1ver/MISP,FloatingGhost/MISP,TheDr1ver/MISP,Rafiot/MISP,FIRSTdotorg/MISP,Rafiot/MISP,FIRSTdotorg/MISP,FloatingGhost/MISP,SteveClement/MISP,MISP/MISP,devnull-/MISP,SteveClement/MISP,crruthe/MISP,MISP/MISP,SteveClement/MISP,FloatingGhost/MISP,cristianbell/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,TheDr1ver/MISP,crruthe/MISP,TheDr1ver/MISP,cristianbell/MISP,cristianbell/MISP,SteveClement/MISP,devnull-/MISP,crruthe/MISP,crruthe/MISP,MISP/MISP,SteveClement/MISP