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A very nice looking machine, you’ve built 
Regarding, “I renamed the references from R1, C1 to something more understandable, like 4k7, 0.1uF and so on, which might have been a mistake……”
Yes that is a mistake. It goes against assumptions all experience gives us.
Let me anticipate another. It is a mistake to put any component value into the PCB silk screen or copper. Component values will change.
Thank you, i have now completely rebuilt my project. Started from skratch, leaving the references as they are. All worked very well.
I encourage you to read this design review guide.
While it is written by people using a similar professional software, Altium, the requirements it identifies are VERY much the same because they are requirements for a good schematic and PCB which is largely not specific to the software in which you do the design.
I am going to guess this will introduce you to a lot of requirements which are all worth while learning.
Hope this helps.
Regarding the original question, " trying to get the two Op-amps, and its power pins, into the same LM393 footprint. But all the time Kicad places two LM393, instead of one. "
In this very voluminous thread, I did not find any reference instructions or a tutorial on how to use the library part for the LM393 with the two op-amps and power pins.
While I too have fought this in the past it is some time ago and I realized I do not understand it enough to explain it or use the feature.
Better yet a tutorial with an example project (files we can upload) which uses such a part or parts.
Anyone?
Indeed. For that reason I have mostly tuned out of this thread
For me this works:
And then, the result is:
The problem here is that OP has changed some settings in KiCad. RefDes is hidden for example. There are also a lot of other issues with the first screenshots (misused labels, shorted capacitor) and those detract from the question. This is also not the place for a generic tutorial. For those it’s better to find a tutorial, or just read the manual on basic KiCad use. What does work well for a forum is for things not in the manuals, or still unclear after reading the manuals, but you do have to be more precise in asking the question.
The Symbol Library Browser is opened.
The Symbol required is found. ( in this case, just for something different, a LM339 )
A description of the symbol is found at the bottom of the sheet: Cyan arrow.
The box up top (Red arrow) will show “Unit A” if it is a multi-unit symbol. If the symbol is a single unit, the box will be empty of text.
If the symbol is multi-unit; clicking on the triangle (Magenta arrow) will display a list of the total number of units available for the symbol. (in this case, 5 units).
Five clicks will result in each of the five units being placed on the schematic.
That’s about all there is to this function. 
In addition, if there is a problem with either the Reference (RefDes), or the unit, you can change either of them in the symbol properties (Hover over the symbol of the LM393 and press e).
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