fdsys mirror: correct some command-line arg bugs
fdsys mirror: correct some command-line arg bugs

chriscondon/billtext,boblannon/congress,Nolawee/congress,sunlightlabs/congress-opencongress,Nolawee/congress,sunlightlabs/congress-opencongress,unitedstates/congress,chriscondon/billtext,boblannon/congress,unitedstates/congress