add a progress bar for writing index files
add a progress bar for writing index files

xouillet/sigal,xouillet/sigal,saimn/sigal,xouillet/sigal,t-animal/sigal,jasuarez/sigal,t-animal/sigal,saimn/sigal,jasuarez/sigal,t-animal/sigal,saimn/sigal,jasuarez/sigal