1) change the colour and size of a poincare plot centroid point
2) add new poincare plot program parameters:
 - movie_title - to set up a poincare plot movie title - string value
 - movie_frame_step - to set up a step for movie frame generation -
integer value
 - movie_identity_line - whether a identity line has to be visible in a
Poincare plot - boolean value
3) changes in
hra_math.time_domain.poincare_plot.poincare_plot_fast_movie_worker.PoincarePlotFastMovieMakerWorker
class:
- change format adn location of the time information displayed at a
Poincare plot 
  (seperated parts for hour, minute and second placed to the right of a
plot)
- increase the size of fonts used in axis labels, title and the time
information displayed at a Poincare plot
- add a new 'private' function 
hra_math.time_domain.poincare_plot.poincare_plot_fast_movie_worker.__draw_identity_line__
  to draw a line of identity