Fix bugs in propti_analyse.py

# `--best_run`

- only simulates one setup, not all of a set
- issues with relative path of model executable (one level higher than optimization)
- sometimes fills model file with nan values

# `--plot_best_sim_exp`

- x,y offset and scaling factors from relations need to be included for plotting (done)
- File "../propti/propti_analyse.py", line 661, in
pr.plot_best_sim_exp(s, pickle_file)
File "/p/project/cjjsc27/MaCFP/MaCFP2020_April/IMP_Runs/propti/propti/propti_post_processing.py", line 397, in plot_best_sim_exp
n_colors=lr)
File "/p/project/cjjsc27/MaCFP/MaCFP2020_April/IMP_Runs/propti/propti/propti_post_processing.py", line 100, in plot_template
ax.set_color_cycle([colormap(k) for k in np.linspace(0, 1, n_colors)])
AttributeError: 'AxesSubplot' object has no attribute 'set_color_cycle'
- naming convention for plots needs to be changed