Allow check_perms to bypass the archives subdirs. When they get large, check_perms can take *forever*, and so people won't run it, which is bad.

I hacked something quickly that should be an option instead:

$ diff check_perms check_perms2 80a81,86

if 'archives' in names:
  print 'removing archives from names array'
  names.remove('archives')
  return