Warn about duplicate figure names (or fix) #141
Description
If the SED-ML defines two plots with the same 'name' (which is perfectly legal in SED-ML), biosimulators gets confused, will only show one of them despite listing both on the pulldown menu, and will refuse to publish the project, but will not tell you why. This either needs to be allowed, or the extra restriction needs to be called out so the user will know what the problem is.