[ENSCORESW-840]. seq_region_start from db in case of circular chromosome
[ENSCORESW-840]. seq_region_start from db in case of circular chromosome

james-monkeyshines/ensembl,Ensembl/ensembl,at7/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,mjg17/ensembl,muffato/ensembl,mjg17/ensembl,at7/ensembl,danstaines/ensembl,at7/ensembl,Ensembl/ensembl,muffato/ensembl,muffato/ensembl,james-monkeyshines/ensembl,danstaines/ensembl,at7/ensembl,muffato/ensembl,mjg17/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,danstaines/ensembl