setup-1.7 can't be used to update, only install

[Brian Dessent]

Charles Wilson wrote:

> Anyway, by the time I got to the chooser, setup-1.7 thought that I was
> doing a brand new installation. I had all the base files selected!
> That's not right.

Urgh, you're right.  You'd have to temporarily switch the 1.5 mounts to
point to the 1.7 tree in order to get setup-1.7 to update an existing
1.7 tree... ugly as heck.

I have some patches mostly finished for setup to make this not quite so
crude.  There are still some corner cases that don't work correctly
which is why I haven't published anything yet.  I'll try to wrap it up
this weekend.

Brian