ENSCORESW-931: if swapping exons because they are identical, transfer supporting features as well
ENSCORESW-931: if swapping exons because they are identical, transfer supporting features as well

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