1) asymmetry_big_picture module:
a) general refactorings concerning creation of a  HRA processing scheme
big picture
b) add a function:
def draw_simple_arrow(...)
to simplify arrow creation process
c) add several improvements involving fonts properties of various
elements of a picture
d) give ability to save generated picture

2) asymmetry_changes_for_one_patient module
a) add several improvements involving fonts properties of various
elements of a picture
b) add functions:
def bold_ticks_labels(...)
def bold_legend(...)
to bold fonts label ticks and legend fonts
c) comments creation of C1d, C2a parts of a picture