Support for core impl. of xtrials
Revert "TMART-63 - Across Trial code to create subset."

This reverts commit e1f721ad285d38ac478d5eb31b558be0e7df363e.
Revert "TMART-63 - Finally getting Across Trial tree code into London Hackathon branch. Broke the DSE Tree style because it used to be a TabPanel, not just a tab."

This reverts commit 07afc88114391bcee8050b27eb37e1eb43164c0a.
Revert "TMART-63 - Across Trial code. This doesn't include the interface work that will need to be done to incorporate the tree somewhere in the interface."

This reverts commit b994794013d5c1dc1f7a847cf1aba763dbca2dd0.

Conflicts:
	grails-app/services/CrossTrialService.groovy
	grails-app/services/I2b2ModifierHelperService.groovy
	grails-app/services/i2b2DemoDataService.groovy
Revert "Merge pull request #53 from sh107/london_hackaton"

This reverts commit 890fa9c271582637694f2c812130b37130469170, reversing
changes made to 7c13a69cabae1d9f80134b5720a58863cb053e2a.
Merge revert_xtrial into thehyve/for_ts_master
Merge pull request #78 from thehyve/for_ts_master

REVERT all across-trial specific functionality; use transparent impl in core-db instead