Setting master version to 4.2.0 dev

[AHaumer]

Setting version to 4.2.0 (also ModelicaTest, Complex, etc. - hope I didn't forget one)
and provide ReleaseNotes.mo for 4.2.0, including the already merged OpAmp (#4643 and #4653)

[maltelenz]

Seems fine to me, but some unnecessary whitespace changes, see comments.

[AHaumer]

Thanks @maltelenz I wasn't aware of these tiny whitespace changes.
Without discussing tool issues in public: I didn't touch these parts of MSL and I don't know how to avoid these changes.
I hope I have addressed them all. Sorry I did this myself because I wasn't logged in at github and therefore I didn't see that I could accept your suggestions easily ...

[maltelenz]

Without discussing tool issues in public: I didn't touch these parts of MSL and I don't know how to avoid these changes.

Perfectly preserving whitespace when editing is a very hard problem for a tool, so whichever tool you used I don't blame it :)

I try to discard small changes like these before committing, but they can slip through the cracks easily.

[maltelenz]

The rest of the placeholder things are probably OK (so it is remembered to fill it out when the time comes), but this sentence seems specific to 4.1.0 and I don't think we need it.

Otherwise fine.

[HansOlsson]

Clearly we are aiming for 4.2.0 at some point in time, but calling it 4.2.0 already will be a bit confusing. Wouldn't it be better to call it "4.2.0 Development" or similarly?

That syntax is specified in Modelica; and intended exactly for such scenarios.

I prefer the straight and clear 4.2.0. It should be clear enough that it isn't released yet by the fact that you are looking at master, and not a release (branch or github release).

[beutlich]

I would not change the version now. See also #4661 as my alternate PR.

[AHaumer]

To be honest, I would prefer "4.2.0 dev" - you see even later it had been taken from master.

[maltelenz]

To be honest, I would prefer "4.2.0 dev" - you see even later it had been taken from master.

If that's the consensus, I'm OK with that, even if I prefer to keep to cleaner version numbers.