setup snapshot

[Robert Collins]

I've uploaded a setup snapshot to http://www.cygwin.com/setup-snapshots/
if anyone wants to try the latest and greatest code.

It's main missing features are
* clickable categories.
* install from local without setup.ini won't allow -src selection.

New features over the net released setup are:
* file magic detection (we can add new file suffixs for tar-bz2 and
tar-gz with 2 lines of code).
* prev/curr/test reinstated (with caveat raised here last week).
* skip only appears for uninstalled packages, and keep always shows for
installed packages.
* the first package version after skip is determined by the
prev/test/curr buttons
* multiple mirror sites can be selected, and setup will present a merged
view of the setup.ini
* keep downloading past errors, and present a error message only at the
end of the entire download
list.

Rob