[m-rev.] for review: avoid excessive goal traversal in trail usage opt

[Julien Fischer]

On Fri, 2 Dec 2005, Julien Fischer wrote:

>
> For review by Mark or Ralph.
>
> Estimated hours taken: 10
> Branches: main
>
> Attach trail usage information to the goal_info rather than recomputing it on
> demand - this avoids repeated traversals of the goal structure during trail
> usage analysis.
>

I'm going to commit this one as I need it in order to continue work on
the trailing optimization.  I'll address any review comments post
commit.

Cheers,
Julien.
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