added calss to use max_feature_length from table rather than having to create it
added calss to use max_feature_length from table rather than having to create it

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