Support filenames with spaces in their names (for non-Mac ftp servers).

This patch must hold the world record for living in my inbox:

  From: John Ehresman <jehresma@dsg.harvard.edu>
  Date: Wed, 23 Aug 1995 16:07:11 -0400

He provided a fix for the version that comes with Python 1.3:
ftpmirror.py revision 1.1...  And it was still relevant!
1 file changed