[Dev] CPIA Script changes

[Donn Denman]

I've made a set of changes to incorporate the feedback from the  
recent CPIA Script code review.  The wiki has been updated to reflect  
the new features.

Here are some of the highlights:
* Classes are accessed using "pim.<className>" now instead of just  
the class name.
* Items are accessed using the same syntax as we do in parcels:   
<className>.iterItems(view),
    except that in scripts the view parameter is optional.
* CPIA BlockEvents have the same syntax, but internally they are  
accessed differently.  I'll send out a separate note on this internal  
organizational change.
* Lots of minor internal changes have been incorporated.

Thanks to all who gave me feedback.

  - Donn Denman