Re: revision library pruning

Hi Andy,

As you said, AXP, as well as `tla-prune-revlib' (from `tla-tools'),
already use interesting heuristics to clean up revision libraries.  I
doubt maintaining a per-revision reference counter would really yield
any significant improvement over these heuristics.

However, incorporating some kind of *configurable* pruning logic within
tla might be beneficial to some users, at least from a marketing
viewpoint: no need to look for third-party scripts to do the job.

Thanks,
Ludovic.