patch applied (cabal-upload): Re-wrote username / password input logic to make it simpler and handle a missing auth file gracefully.

[bjorn at bringert.net]

Tue Apr 10 09:30:29 PDT 2007  bringert at cs.chalmers.se
  * Re-wrote username / password input logic to make it simpler and handle a missing auth file gracefully.

    M ./src/CabalUpload.hs -17 +28