deprecate variation related methods that will move into the variation API
deprecate variation related methods that will move into the variation API

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