If you upgrade point releases ie. 2.0.0.GA to 2.0.1.CR1 then you can typically 
just copy over the lib folder and be done with it.  The problem with creating 
an automated script is going from major releases like 1.2.1.GA to 2 GA, in this 
case the tool would need to update all schemas and namespaces and api in your 
code.  It would be not be a trivial tool to create.  To most customers I deal 
with I recommend just creating a clean project and migrating the old code over. 
 I've see a lot of problems when this is not done, so I am dogmatic on 
recommending it now, always create a clean  project :)

And if you feel like tackling a daunting task, feel free to write such a 
migration tool and contribute it back to the project.

-Samuel

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