Fix tests with @Ignore in ConceptServiceTest

There are 2 tests with the @Ignore annotation in ConceptServiceTest that call getConcepts that returns a list of ConceptSearchResults, this is because the test database H2 requires that all selected columns are included in the group by clause. Fixing the tests to pass might involve tweaking the hibernate criteria in the DAO layer or switching to HQL

Also fix EncounterServiceTest.getEncounters_shouldGetAllTheUniqueEncountersThatMatchTheSpecifiedParameterValues()
And EncounterServiceTest.getEncounters_shouldNotReturnVoidedEncountersIfIncludeVoidedIsSetToTrue()