Added check that requirement is not already displayed.  This version uses the ID and not the name.
Merge branch 'dev-set3-iteration3' of https://github.com/333fred/wpi-suite-tng into dev-set3-iteration3

Conflicts:
	RequirementsManager/src/edu/wpi/cs/wpisuitetng/modules/requirementsmanager/view/RequirementTableView.java

Fixed conflicts that were created while I was working on the check using rUID for duplicate tabs.
Merge branch 'dev-set3-iteration3' of https://github.com/333fred/wpi-suite-tng into dev-set3-iteration3
Merge branch 'dev-set3-iteration3' of https://github.com/333fred/wpi-suite-tng into dev-set3-iteration3