add grouping of poincare plot program parameters in method:
hra_math.time_domain.poincare_plot.poincare_plot.PoincarePlotManager.getParser(self)
three group are added: 
common - common parameters, always accesible
statistics - parameters available in the context of statistics
generation
movie - parameters available in the context of movie generation

add parameter valued_only in method
hra_math.model.parameters.poincare_plot_parameters.PoincarePlotParameters.info(self,
valued_only=False)
	if valued_only equals True then only parameters with value != None are
presented

in the class
hra_math.model.parameters.poincare_plot_parameters.__ParameterInfo__
2 members are added:
group - for parameters group identification
group_description - description of a group