added debugging to copy.go
added debugging to copy.go

acasajus/gb,mopemope/gb,ches/gb,tianon/gb,tbruyelle/gb,tianon/gb,davidkaya/gb,tbruyelle/gb,mopemope/gb,hyper-carrot/gb,Luit/gb,inconshreveable/gb,hyper-carrot/gb,constabulary/gb,constabulary/gb,ches/gb,inconshreveable/gb,guiquanz/gb,mopemope/gb,davidkaya/gb,MerlinDMC/gb,constabulary/gb,URXtech/gb,lparkes/gb