a) fix an error in function
hra_core.misc.is_positive(value)
involving return of int value instead of boolean, because of the
previous condition 
int(value) and value >= 0

b)  correction in classes:
hra_math.model.text_file_data_source.TextFileDataSource
hra_math.model.numerical_file_data_source.NumericalFileDataSource
in a method getData(self):
it is needed to return always 2 dimensional array of data
but if data contains only one column then 1 dimensional array
is returned, that's why fetched 1 dimension array have to be wrapped
in another numpy array

c) correct a condition on not empty poincare plot time index column and
empty time_format in method:
hra_math.model.parameters.data_vector_parameters.DataVectorParameters.validateDataVectorParameters(...)


d) change name of some poincare plot parameters to more lengthy
versions:
-d to -data_dir 
-e to -extension
-o to -output_dir  
-out_sep to -output_separator 
-override  to -override_existing_outcomes
in package
hra_math.time_domain.poincare_plot.poincare_plot.PoincarePlotManager