[packagekit] [PATCH] SQLite Package-Cache for PackageKit

[Matthias Klumpp]

Hello!
The patch below adds (optional, but enabled by-default) support for
generating a SQLite db package cache on Refresh().
The plugin will later be extended. Having this feature is crucial for
implementing Software-Center-like applications using PackageKit.
The problem is that running GetDetails() is incredibly slow right now
on most backends, so Refresh() calls will take minutes. This could be
avoided by adding a new backend method to return all packages and
their details, so backends can do optimizations internally.
The feature is not yet finished, but it would be a good thing to have
it in PK master as soon as possible to get feedback, that's why I'm
writing this request for patch-review.
The new plugin will also take all jobs from the former
update-package-list and replace it.
Thanks you!
Cheers,
    Matthias
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