Duplicate model function in OMEdit should work without compromises

[Francesco Casella]

A very common model development pattern, particularly among beginners, is to start duplicating existing and working models, possibly putting them in a completely different package, and then applying some changes.

OMEdit currently falls short of providing this basic feature, because the duplicated models are often invalid for various reasons. Expert users can try to fix them manually, but this is not an option for beginners.

I had a discussion at the last Modelica Design meeting with Leo Gall, and basically on of the reasons why he can't start using OMC seriously with his customers is that he cannot follow this pattern. Christian Kral is also suffering with his students, and I guess many others are longing for this feature, even though they don't open tickets.

I think having a decent Duplicate functionality is definitely a must-have for 2.0.0, so I'm opening this combo ticket as a blocker for that release.

Currently open issues on this topic are: #4240, #4536, #4799, #4875, #5191, #5343, #5344. We should have them all fixed in time for 2.0.0

Of course it would be nice if at least the issues that are easier to fix are done in time for 1.14.0. @adeas31, what do you think?