Select variants for DbIEM

- Use ensembleGeneID for selecting variants found in dbIEM. Overlapping genes with ensembleGeneID not found in dbIEM will be printed to orphan file. A hit in dbIEM and another geneID which does not belong in the DbIEM will be printed to both orphan and dbIEM.
- Added new feature to intersectCollect to enable selection of variants given Db files.