[PEAK] Trellis 0.6a1 release

[Phillip J. Eby]

I forgot to post an announcement earlier this week, but I've released 
Trellis 0.6a1 to the Cheeseshop.  There are many API changes since 
the 0.5b1 release; if you find that something has had its name 
changed or its import location moved, please note that you should not 
blindly update your code to the new name or location!  In all cases, 
the use of a renamed or relocated API means you need to review or 
change the code surrounding your API call.

There are substantial new documents on the Wiki about the new 
features and modules, including:

* peak.events.stm (Software Transactional Memory)

* peak.events.activity (event loops, co-operative multitasking, and 
time services including timeouts and delays)

* peak.events.collections (miscellaneous Trellis-managed data structures)

The tutorial has been significantly revised, especially with respect 
to how mutable data structures are handled, and the new ability for 
rules to update mutable data structures -- both trellis-managed and 
otherwise.  *Please* review it before you try to port code that's 
based on 0.5b1.

Actually, despite all my warnings, if your code uses only simple 
rules, values, and components, you might not need to make any changes 
at all!  But it's not likely that you've got a significant 
0.5b1-based application that doesn't use any of the changed APIs.