seq_region_ids may not be consecutive
seq_region_ids may not be consecutive

UpdateMSA does not mantain that condition any more, so relying on the
autoincrement may break the matching between `dna` and `seq_region`
tables in the dst database

Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara