Make the output_dir cli argument optional, and cleanup the messages.
Make the output_dir cli argument optional, and cleanup the messages.

muggenhor/sigal,kontza/sigal,xouillet/sigal,saimn/sigal,elaOnMars/sigal,kontza/sigal,jdn06/sigal,t-animal/sigal,Ferada/sigal,t-animal/sigal,jasuarez/sigal,t-animal/sigal,franek/sigal,Ferada/sigal,cbosdo/sigal,jasuarez/sigal,jdn06/sigal,saimn/sigal,Ferada/sigal,elaOnMars/sigal,cbosdo/sigal,muggenhor/sigal,saimn/sigal,xouillet/sigal,kontza/sigal,jdn06/sigal,cbosdo/sigal,franek/sigal,jasuarez/sigal,xouillet/sigal