Please add force hint to enable metaphlan2-data testing migration

[Andreas Tille <andreas@an3as.eu>]

Hi,
 
please add a force-hint to add the testing migration of
 
    metaphlan2-data 2.6.0+ds-1
 
While metaphlan2-data is arch all it has an unsatisfiable Depends:
bowtie2 on i386 which seems to block the testing migration.
 
Thanks for your release team work

      Andreas.

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