1) changes in module hra_math.model.data_vector_segmenter

class __DataVectorSegmenter__:
- remove member __mark_last_segment__ in,  use changed condition for
__last_segment__ property instead
  (None value of __last_segment__ means do not use last segment feature)
- introduce property method  named stop(self) to get information if
processing
   with use of segmenter has to be stopped
- add in __init__ method a test if there is a time period of an item is
    greater than data window size, in this case further processing is
stopped

use new stop method and changed last segment feature in classes:
__BitDataVectorSegmenter__
__SampledDataVectorSegmenter__
__SteppedDataVectorSegmenter__

2) interrupt processing of statistics calculation or movie generation if
stop property of segmenter object is True
	in a module  hra_math.time_domain.poincare_plot.poincare_plot_generator