UI and flag tuning
UI and flag tuning

 * Add --expand or --replace, which in most cases is what people want to add
   new names to lineages without always forcing renewal
 * --reinstall is now also --keep, and the UI is aware if it's in certonly or
   run mode
 * Explain --duplicate better

letsencrypt/letsencrypt,xgin/letsencrypt,thanatos/lets-encrypt-preview,twstrike/le_for_patching,VladimirTyrin/letsencrypt,dietsche/letsencrypt,brentdax/letsencrypt,lmcro/letsencrypt,wteiken/letsencrypt,jtl999/certbot,goofwear/letsencrypt,martindale/letsencrypt,TheBoegl/letsencrypt,VladimirTyrin/letsencrypt,brentdax/letsencrypt,DavidGarciaCat/letsencrypt,kuba/letsencrypt,kuba/letsencrypt,mitnk/letsencrypt,bsmr-misc-forks/letsencrypt,jtl999/certbot,wteiken/letsencrypt,lmcro/letsencrypt,DavidGarciaCat/letsencrypt,stweil/letsencrypt,martindale/letsencrypt,twstrike/le_for_patching,jsha/letsencrypt,bsmr-misc-forks/letsencrypt,xgin/letsencrypt,goofwear/letsencrypt,TheBoegl/letsencrypt,stweil/letsencrypt,mitnk/letsencrypt,dietsche/letsencrypt,thanatos/lets-encrypt-preview,jsha/letsencrypt,letsencrypt/letsencrypt