All coordinates in model JSON should be specified in nm

[rklancer]

Right now, image locations in converted JSON files are specified in "Classic length units" (units of length 0.1 Angstrom, which correspond to 1 pixel in Classic MW)

They should be specified in nm, like every other length value in model JSON files.

[rklancer]

Image rendering code is making use of scaling_factor (which should be renamed to lengthUnitsPerPixel)

lab/src/lab/views/molecule-container.js

Line 182 in e61e076

scaling_factor = (size.width/(modelSize[0]*100));

The factor of 100 should not be required. Moreover, the existing d3 scales x and y should be used instead.