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This commit actually does some different things:
* When doing asynchronous decryption of incoming documents in soledad client
during a sync, there was the possibility that a document corresponding to
a newer generation would be decrypted and inserted in the local database
before a document corresponding to an older generation. When this
happened, the metadata about the target database (i.e. its locally-known
generation) would be first updated to the newer generation, and then an
attempt to insert a document corresponding to an older generation would
cause the infamous InvalidGeneration error.
To fix that we use the sync-index information that is contained in the
sync stream to correctly find the insertable docs to be inserted in the
local database, thus avoiding the problem described above.
* Refactor the sync encrypt/decrypt pool to its own file.
* Fix the use of twisted adbapi with multiprocessing.
Closes: #6757.
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