[patch] support xclipboard

[Pavel Tsekov]

> Patch for support XCLIPBOARD from mc.
> It can work in 2 way:
> - using Xlib if mc compile with-x
> - using external program if mc compile without-x
> External program is xclip ( http://people.debian.org/~kims/xclip/ ) and
> qtclipb ( attached file or http://www.klv.lg.ua/~vadim/ ).
> qtclipb be writed for work with KDE since xclip can not insert into
> XCLIPBOARD under KDE.

I'll try to review this patch in the next few days. In any case I'll split
it in 2 or 3 (Xlib and non-Xlib variants) parts and I'll commit/review them
separately.

-- 
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