Rename Custom Properties

[Marty Knapp]

Is there a way to rename custom properties by script and retain the 
contents of the custom properties? I know you can do it with the 
inspector, but I would like to be able to do it by script so that my 
user's stacks can be updated with the new names. Or will I need to cycle 
through the customKeys, temporarily store the value, create a new custom 
property and insert the value into the new cp?

Thanks,
Marty Knapp