Rawhide stability

[Roland McGrath]

> Primarily, I have to update manually and often have to exclude some broken
> deps.

This would be greatly aided if yum had a "smallest usable transaction"
mode.  That is, instead of always doing one giant upgrade that barfs if
there are dependency problems, it would take each update available and suck
in only its necessary deps as if you'd done "yum upgrade foobar" on the
individual package, finish that, and then do the next transaction.  When
some packages have dependency problems, they get punted but not everything
else unrelated.  So instead of either "wait for a day when yum upgrade works"
or "mess around manually a lot", every day has an "easily upgrade what
upgrades easily" option.