[Patch] expand,unexpand multibyte support

[Ondrej Oprala]

Hi, I've been working on multibyte support for the {un,}expand utilities 
lately, my approach being similar to Padraig's from 2010 ( 
http://lists.gnu.org/archive/html/coreutils/2010-09/msg00029.html ) . 
Both tools now read by lines, not bytes, and then iterate over the 
characters properly.

Since both tools share huge amounts of code, I've created an 
expand-core.c file to hold it.

I've also noticed that if you add libunistring to bootstrap.conf's list 
of modules, libcoreutils.a will have problems compiling, hence the 
gnulib patch.

I was planning on doing cut next, if this gets accepted well.

Thanks,
Ondrej.

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