rewrite multiline code

[zaz600]

rewrite multiline code to fix dutchcoders#8

[zaz600]

1e1d28f
From RFC-959:

Thus the format for multi-line replies is that the first line
will begin with the exact required reply code, followed
immediately by a Hyphen, "-" (also known as Minus), followed by
text. The last line will begin with the same code, followed
immediately by Space , optionally some text, and the Telnet
end-of-line code.

        For example:
                            123-First line
                            Second line
                              234 A line beginning with numbers
                            123 The last line

[VincenzoLaSpesa]

Merge done.
Thank you.

I think I'll update the wiki for documenting with this behavior.