1) add a new function:
hra_core.collections_utils.nvl_and_positive(*iterable)
	which returns first not None and positive value in iterable

2) add new parameters used by Poincare movie creation process 	(employed
for the fast version, chaco library):
movie_axis_font
	movie axis font, example: '15 pt bold italic' [optional]
movie_title_font
	movie title font, example: '15 pt bold italic' [optional]
movie_tick_font
	movie tick font, example: '15 pt bold italic' [optional]
movie_frame_pad
	movie frame pad, the space used for axes and ticks labels [optional]