docstringed new set of configurators

MDANSE/Framework/Configurators/IConfigurator.py

MDANSE/Framework/Configurators/IntegerConfigurator.py

...Framework/Configurators/InterpolationOrderConfigurator.py

MDANSE/Framework/Configurators/MMTKTrajectoryConfigurator.py

...E/Framework/Configurators/McStasInstrumentConfigurator.py

MDANSE/Framework/Configurators/McStasOptionsConfigurator.py

...E/Framework/Configurators/McStasParametersConfigurator.py

...SE/Framework/Configurators/MultipleChoicesConfigurator.py

...SE/Framework/Configurators/NetCDFInputFileConfigurator.py

...SE/Framework/Configurators/OutputDirectoryConfigurator.py

MDANSE/Framework/Configurators/OutputFilesConfigurator.py