Utility for safe updating of ports in base system

[Kris Kennaway]

Doug Barton wrote:
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> A user pointed out to me that on the project ideas page the following 
> entry remains:
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> Write a new utility for the pkg_install suite, possibly named 
> pkg_upgrade(1), implementing a subset of existing portupgrade 
> functionality. The required functionality is:

FWIW, I have no idea why this is on the project list.  I suspect it was 
added by someone without any consensus that it's a good idea.

We have several upgrade tools in ports, and that is where they belong. 
Any effort should be spent on improving existing tools, unless you can 
make a really good case why they are fundamentally flawed and need to be 
rewritten from scratch, discarding all of the previous work on them.

Kris