we might not get a body when we get a 401 with a set of WWW-Authenticate:
headers. This fixes the problem Kevin Roth detected in 7.10.8-pre4 and pre5.
Verified by test case 91.

on Oct 20, 2003.

If not user or password is set, they will point to a "" string.

been run "as usual"

2. make the libcurl and curl version the same

  input
o have ->passwd and ->name be NULL if no name/passwd was given
o only set default user+password for FTP if no userpwd was given