remove strict "bug only" constraint from "last 15 days" statistics (fixes issue #2055)
remove strict "bug only" constraint from "last 15 days" statistics (fixes issue #2055)

thebuggenie/thebuggenie,JonathanRH/thebuggenie,praveenscience/thebuggenie,milkyway-git/thebuggenie,milkyway-git/thebuggenie,SamMousa/thebuggenie,nrensen/thebuggenie,azaghal/thebuggenie,SysBind/thebuggenie,SamMousa/thebuggenie,nrensen/thebuggenie,thebuggenie/thebuggenie,hurie/thebuggenie,Rvanlaak/thebuggenie,LogosLabs/thebuggenie,gabor-udvari/thebuggenie,thebuggenie/thebuggenie,deshion/thebuggenie,gabor-udvari/thebuggenie,SamMousa/thebuggenie,Rvanlaak/thebuggenie,nrensen/thebuggenie,SysBind/thebuggenie,milkyway-git/thebuggenie,deshion/thebuggenie,thebuggenie/thebuggenie,LogosLabs/thebuggenie,gabor-udvari/thebuggenie,praveenscience/thebuggenie,gabor-udvari/thebuggenie,LogosLabs/thebuggenie,praveenscience/thebuggenie,azaghal/thebuggenie,SysBind/thebuggenie,deshion/thebuggenie,hurie/thebuggenie,deshion/thebuggenie,milkyway-git/thebuggenie,hurie/thebuggenie,SysBind/thebuggenie,Rvanlaak/thebuggenie,JonathanRH/thebuggenie,azaghal/thebuggenie,azaghal/thebuggenie,hurie/thebuggenie,SamMousa/thebuggenie,Rvanlaak/thebuggenie,LogosLabs/thebuggenie,JonathanRH/thebuggenie,thebuggenie/thebuggenie,JonathanRH/thebuggenie,nrensen/thebuggenie,praveenscience/thebuggenie