[Rpm-maint] [rpm-software-management/rpm] Add deltarpm support (#433)

[Florian Festi]

Allow rpm to directly process delta rpms. One way would be to have a previous unpack step that places the files on disk with tsid suffixes - just as rpm does during installation. The delta rpm would then be added to the transaction with a special flag. Most operations would be done just like with a normal package. Just during the installation files would not be unpacked. Instead fsmCommit() would move the previously placed files to their final location.

This may need some extra code to remove or not even place the files that are excluded by (command line) options.

This should save a lot of diskspace during updates and also time and IO. This will probably need support from the updaters unless they can be tricked by deltarpm that they are now dealing with proper packages.

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