added generate_figure_one_hovering_rate
transforming to float instead of int when sorting group
rename from transfer rate to charging efficiency
changed the title of the figure
added generate_figure_demo_least.py
added base_distance experiment
small changes to charging_efficiency
updated object_manager for the new distance experiment
changed the legend of a few figures
added two type of figure generator, base_distance and charging rate
added UAV_power_capacity based experiments
added distance as a variable to the test_config
correct the UAV energy capacity
print normalized value in terminal and use less algorithms for varying hovering rate