File transfer protocol selection

RBBS-PC allows you to select a default file transfer protocol.
RBBS-PC will use the selected protocol for all uploads and downloads unless
you specify a protocol when downloading/uploading.

TIPS:
1.  You may want not to have a default transfer protocol if you use a
    variety of protocols.  Select the N)one option and RBBS-PC will ask for
    your preferred protocol before each file transfer.

2.  The protocol you want RBBS-PC to use must also be used by your
    communications package.  Protocols available in RBBS-PC include Ascii
    (no error checking), Xmodem, Xmodem/CRC, and 1K-Xmodem.  Others can be
    installed by the Sysop, such as Kermit, Windowed Xmodem, Zmodem, and
    Batch Ymodem.  Xmodem is the most widely supported, but Ymodem and
    Zmodem are faster.

3.  You can override the default my specifying the protocol on the same
    command line as D)ownload or U)pload.  E.g.  "D FILE.TXT C" downloads
    file FILE.TXT in Xmodem/CRC no matter what the default protocol is.

