Performance condition
* allows to control the loop according to latest performance results
* integrated into TestStage
AnnotatedHelper can lookup both core and libs
* fixes in XSD generation
* ReflexiveConverters can search for implementing classes
NumberObjectGenerator: ranges have to be computed as longs
Better error handling of stage initialization.
Output defaults again to stdout_slave_$LOG4J_PREFIX.out
Refactored how statistics are used from TestStage
* statistics prototype is loaded through ReflexiveConverter as a property
* removed HistogramStatistics and HistogramOperationStats -> will be added as extension
Added HistogramOperationStats, and refactored bar chart generation
* mean and stddev retrieved from HistogramOperationsStats seems sometimes suffering from some HdrHistogram bug