Add two new options for the SFTP/SCP/FILE protocols: CURLOPT_NEW_FILE_PERMS

and CURLOPT_NEW_DIRECTORY_PERMS.  These control the premissions for files
and directories created on the remote server.  CURLOPT_NEW_FILE_PERMS
defaults to 0644 and CURLOPT_NEW_DIRECTORY_PERMS defaults to 0755