The recipe upstream history can't be reconstructed, so we need to be
able to export it out of an old database an import it into the new one.
There's also a "remove-duplicates" function; whilst not strictly
necessary it did help us to remove duplicate records resulting from
running the import twice (due to a bug) and may be useful in future
under similar circumstances.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
