:distances for :ref datasets: reduced dbs
:distances for :ref datasets: reduced dbs

.db files are no longer saving the (very large) "regions" table. The .db files for ANI were reaching several hundred Mbs, so this should significantly improve performance. This change has no retroactive effect.

bio-miga/miga,bio-miga/miga,bio-miga/miga,bio-miga/miga