Fix log axes when data contains zero plus a few new features

This release fixes the plot issue when a user tries to log an axis and the data contains a zero (silently ignored as other plotting app do).

New features:

1. Right-click on graph to save png image to clipboard
2. Added additional variables to plot in time course (default was as before)
3. Updated steady state panel to plot 3d plots of sensitivities
4. Added python export script that allows user to preserve time course or parameter scan experiment

Opening uncertified apps required the following steps (especially for Tahoe OS)

1. Run app, it complains, you must click DONE
2. Within on hour, go to System Settings -> Privacy & Security
3. Scroll down to the security section and find the message saying the app was blocked
4. Click the Open Anyway, enter your password
5. Either the app opens at this point, if not, go to the app location and open it there
6. In theory you won't have to do this again