adding [minimal] symlink support

[marco gaddoni]

>
> > i need support of symlinks and devicefiles. Currently svn does support
> > symlinks and dont support device files (the ones that go in /dev).
>
> This may work fine when you use *one* platform for development.
> Anything that is related to symlinks, device nodes, and other special
> files tends to break in nasty ways when multiple platforms are involved
> though.


with svn, a symlink in windows is a file that store the target of the
symlink and is tagged with the property svn:special;
this is the contenent of the command free (that is a symlink)
as seen in windows:

 link ../../bin/busybox

it work good for me.

supporting device files as regolar files with svn:special property and
content Device 03:01 should work fine.
And is not too different from the plan Matt outlined to support
symlinks. maybe i will try to hack hg.

>
> > I am developing both in linux and windows.
>
> And this is the point where keeping everything in the repository,
> including "special" files, like symlinks, device nodes, hard links or
> anything else that is "special" in any way, breaks mightily.
>
> Windows doesn't support device nodes.  It doesn't support symlinks in
> the UNIX sense either.  IMHO, it's not Mercurial's job (or the job of
> any other VCS) to try to work around system limitations :-(


  imho hg is working well now in windows and can be easily improved.
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