various fixes and improvements (scanner+plotter)

[Python-simulation]

• Fixe bug when scanner would not enable combobox if two recipes were measured fast (no time to plot) and last recipe didn't have data in scan (but has dataframe): fixe scanning\figure.py by moving 'enable' above 'return if empty' condition
• Fixe difficulty to click on combobox during scan due to refreshing of combobox list every point measured. Now only refresh if list changes (also fixed it in plotter)
• Better data import in plotter: now data is imported in data and not figure! can now import many files without replotting everything for each file imported
• fixed for combobox found in scanner should leads to faster plot in plotter when changing dataset with same labels
• Add icons
• add email address to setup.py