Eliminating redundant problems by detector hierarchy.

...com/oracle/truffle/r/test/packages/analyzer/Location.java

.../com/oracle/truffle/r/test/packages/analyzer/Problem.java

.../truffle/r/test/packages/analyzer/detectors/Detector.java

...ffle/r/test/packages/analyzer/detectors/DiffDetector.java

...fle/r/test/packages/analyzer/detectors/DummyDetector.java

...kages/analyzer/detectors/InstallationProblemDetector.java

...le/r/test/packages/analyzer/detectors/RErrorDetector.java

...t/packages/analyzer/detectors/RInternalErrorDetector.java

.../r/test/packages/analyzer/detectors/SegfaultDetector.java

...analyzer/detectors/UnsupportedSpecializationDetector.java

...truffle/r/test/packages/analyzer/dump/AbstractDumper.java

...cle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java

...ruffle/r/test/packages/analyzer/parser/LogFileParser.java