[Dev] New schema_status tool

[Phillip J. Eby]

I've just added a tool to check the status of kinds/classes ported to the 
schema API.  If you're one of the people working on porting, you can use it 
as an automated "to-do" list, as it groups classes and kinds by the kind of 
work that needs to be done to port them.  To run it, use:

     RunPython -m schema_status

You'll then get an extensive report on what Kinds don't have classes 
defined, and what things need to be done to/around various classes and 
modules to get them to synch up with the schema defined in parcel.xml.

If you're not one of the people actively working on porting, you can use 
the script to check on our progress, or just to see where changes are 
likely to take place in the near future.