Blocking points raised are:

- We need to be able to validate that the delta is correct before using
it. We could

+ provide delta indices like we have packages - this does require pdiff support 
so we don't have to download the entire index everytime, as that would make 
deltas pointless for small updates
+ sign the deltas directly - but that's too slow, signatures are slow
+ provide one delta index per source package - might be useful compromise

- we need to uniquely identify package. I proposed we introduce a
package id, based on the hash of the mtree (+ control fields maybe), but
this does need mtrees first (or hashing the md5sum file)

- space usage on mirrors, how to keep this in check

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https://bugs.launchpad.net/bugs/21837

Title:
  debdelta integration / zsync support

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