Cache directory tagging proposal, version 0.2

[Bryan Ford]

For those interested, I have updated my cache directory tagging proposal to 
"version 0.2" based on feedback on this list and elsewhere.  Again, it's at:

        http://www.brynosaurus.com/cachedir/

While nothing really substantive has changed in this version, I've fleshed out 
the introduction and Alternative Approaches sections, particularly in order 
to clarify the reasons it is not sufficient just to standardize the locations 
where applications place their caches, but also to address other concerns and 
issues that have been brought up.  Again, comments most welcome.

Thanks!
Bryan