Tests for issues fixed in ed95463

#KT-2831 Fixed
#KT-3286 Fixed
#KT-3863 Fixed
#KT-3976 Fixed
Test for an obsolete issue

#KT-2956 Obsolete
Unused method removed
Useless code removed
Useless code removed
Throwing FileComparisonFailure enables opening test data file in diff dialog right from the test console
Unused parameter removed