refs #6667 Changed ExperimentInfo::populateInstrumentParameters

to understand booleans, though no unit tests found for populateInstrumentParameters to check this stuff works properly
refs #6667 Exported parameter type from the parameter map

Very ugly done, as python should be able to retrieve the value and type together. But can not find better way at the moment.
refs #6667 Minor changes to export parameter type

and substitution dictionary in DirectEnergyConversion