[UAT-166] Backend fixes for grid view issues

- Remove unused logic for disambiguate facts
- Give more ext.js-frienly ids for data cells
Merge branch 'issues/uat-166-gird-view-cell-id' of https://github.com/thehyve/transmartApp into issues/uat-166-gird-view-cell-id

Conflicts:
	grails-app/services/I2b2HelperService.groovy