Finished cleanup, fixed all pcbnew DRC errors reported. First attempt at

generating Gerbers. The result is somewhat surprising, since each Gerber is
huge (10MB+). This turned out to be related to the way KiCAD fills copper
polygons. Version 5.1.x that I use has support for some better pouring
algorithm, while the 4.x version Fredrik used at the time of conversion had
some different and obviously inferior pouring algorithm. I updated all the
shapes to use the newer fill algorithm and this helped a bit, but didn't
entirely solve the problem. Internal layers with large planes still produce
very large Gerbers (~1MB), but they're more or less manageable now. Further
research indicates there currently seems to be no way of further reducing
Gerbers, see eg.: https://forum.kicad.info/t/gerber-files-are-too-large-due-to-thousands-of-drawn-features/17750

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