Port Function to Handle OS Upgrades

[Jeremy Lavergne]

What are our thoughts on providing a new function to handle preparing  
for an OS upgrade (or run immediately following)?

This procedure would need to:
  * remove all build directories
  * trash all irrelevant archives
  * dump a list of what is installed (either to be read in by another  
function or simply catted to port)
  * uninstall everything

We can provide two separate functions, really.  One, to dump the  
installed and their variants; another to remove all irrelevant files  
in the tree.

There are many more instances where we can get irrelevant files in the  
tree, such as upgrades.  Perhaps having this function be abstract  
enough we can use it in both instances would be to our coding advantage.

Gentlemen?


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