Originally, the wm-icons package contained a lot of symlinks.

Mainly they were used for missing icons, which were symlinked to the
corresponding closest icon in the same icon set. This is also what user
gets on instalation (symlinks of missing icons are recreated).

Since cvs (and autoconf/automake as well) does not like symlinks, all
symlinks were replaced by _symlinks.lnk file, which contains pairs of
files (in 'cp' or 'ln -s' order) on each line.

When adding/removing icons it is probably more safe just to edit the
corresponding _symlinks.lnk file. However it is sometimes needed to
get final symlinked files. This can be done by:

  make _unpack-symlinks
  # edit/add/remove symlinks
  # even 'make install' should work as expected
  make _pack-symlinks

If using this live-symlinks mode, a care should be taken when working
with cvs and building a dist. It is suggested to end this mode first.
