* ftp.c, cmds.c, cmdtab.c, main.c, secure.c, ftp_var.h: Replace

    * ftp.c, cmds.c, cmdtab.c, main.c, secure.c, ftp_var.h: Replace
        global variable level with separate variables clevel and dlevel
        for the control channel and data channel protection levels,
        respectively, so that the user may specify separate protection
        levels for each channel.  Similarly, functions such as getlevel
        and setlevel are now getclevel/getdlevel, and setclevel/setdlevel.

        * cmdtab.c: Add new FTP commands "cprotect" to allow the user to
        set the control channel protection level (similar to "protect"),
        and "ccc" (Clear Command Channel) which sets the control channel
        protection level to clear (per the RFC).

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@10804 dc483132-0cff-0310-8789-dd5450dbe970