Improve GATK4's error logging

Author: bbimber

SequenceAnalysis/api-src/org/labkey/api/sequenceanalysis/run/AbstractGatk4Wrapper.java

@@ -82,6 +82,7 @@ public String getVersionString() throws PipelineJobException
         List<String> args = new ArrayList<>();
         args.add(SequencePipelineService.get().getJava8FilePath());
         args.addAll(SequencePipelineService.get().getJavaOpts(_maxRamOverride));
+        args.add("-DGATK_STACKTRACE_ON_USER_EXCEPTION=true");
         args.add("-jar");
         args.add(getJAR().getPath());
         args.add("--version");