smart errata update details

[Anders F Björklund]

I've rewritten the previous "errata flags" code,
into "update details". This now adds a separate
ErrataInfo object, instead of abusing the flags
like it did before for setting the errata type.

https://bugs.launchpad.net/bugs/244501 (flags)
https://bugs.launchpad.net/bugs/253902 (info)

As before, there are file parsers for yum's
"updateinfo.xml" and urpmi's "descriptions"
but there is no such parsable information for
Debian or Slackware packages (missing upstream).

A simple test command was added, to view it:
smart info --errata
Sample output attached for some random packages
from fedora/opensuse/mandriva update channels.

--anders

PS. It still sets the flags for compatibility,
     until the PackageKit backend is updated...
     But using smart "flag" for this information
     is fundamentally broken, as it is "config".

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