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Pack bio_db_repo -- doc/tbd.txt

To be done:

When the first bio_db_repo is downloaded on demand also copy prolog/bio_db_repo.pl and pack.pl. (writing message on screen: bio_db_repo pack is created to host bio_db related datasets. If bio_db itself is updated, the datasets will remain installed.)

Equivelantly, have an option to install a priori a skeleton version. (If above machinery is in place that should be trivial to add in bio_db.)