Symlink support
Add symlink support; with UAC, you may need administrator's privileges
to create symlinks, but you can at least read them.
As reparse points on Windows differentiate between file and directory
links, we just assume that file links are meant for the time being;
it might be very hard to determine the type before the target exists,
but it is thinkable to change the type on-the-fly.
A bridge to cross when we arrive there (read: something for somebody
to fix who actually has that problem).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>