Added text about how to convert certificates to PEM format

  Otherwise, curl will first attempt to use v3 and then v2.

  To use OpenSSL to convert your favourite browser's certificate into a PEM

  formatted one that curl can use, do something like this (assuming netscape,

  but IE is likely to work similarly):

    You start with hitting the 'security' menu button in netscape. 

    Select 'certificates->yours' and then pick a certificate in the list 

    Press the 'export' button 

    enter your PIN code for the certs 

    select a proper place to save it 

    Run the 'openssl' application to convert the certificate. If you cd to the

    openssl installation, you can do it like:

     # ./apps/openssl pkcs12 -certfile [file you saved] -out [PEMfile]

RESUMING FILE TRANSFERS

 To continue a file transfer where it was previously aborted, curl supports