plac - remove unnecessary 'requires'

argcoffee, helpformatter, plac -
   replace (x for i in [0...n]).join('')
   with (new Array(n+1).join(x) which compiles more compactly
   if we want array instead use, _.times()

TODO - remove the DEBUGs, which slow down the code
   without these, coffee version runs as fast as the js.