1) change property method:
hra_math.model.parameters.poincare_plot_parameters_manager.PoincarePlotParametersManager.parameters_info(self)
hra_math.time_domain.poincare_plot.poincare_plot_generator.PoincarePlotGenerator.parameters_info(self)
into usual methods, because when introspection uses
PoincarePlotParametersManager object, for example to get all property
fields,  this method shows some information which is absolutely
undesirable effect

2) add a new function:
hra_core.introspection.save_private_properties(source, _file)
used to save source's object field properties into a file

3) add a new poincare plot parameter (with default value true) named
save_parameters used to set up creation of a file of all defined
parameters; the file has a name 'pp_parameters.txt'