Correctly install examples.
Don't print number of reductions steps if none performed.
Add a random walk to Demo.hs.
Move some GC code to gc.C
Add remap array.
Add function do_remap( ).
Compute the remap array.
Check that remap(remap(r)) = remap(r).
Actually remap the closures.

We don't specifically free the index-vars, though.
They could be referenced by heads.
Avoid creating and destroying object_refs in probability_for_context( ).