[m-dev.] for review: RL bugs

[Simon Taylor]

> > compiler/tree.m:
> > 	Added `tree__tree_of_lists_is_empty', which is similar to
> > 	`tree__is_empty' except that `node([])' is also considered empty.
> > 	This is useful for trees of instructions.
> 
> Are there any cases where we actually want tree__is_empty to fail
> when the only nodes in the tree contain nil? I can't think of any.
> If I am right, we don't need a new predicate, just a fix to the old one.

`tree__is_empty(tree(T))' has the wrong type signature - the argument
type needs to be `tree(list(T))'.
There are no more calls to `tree__is_empty' after this change.

Simon.
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