document __init__loadsave

[JonasIsensee]

I was struggling with the error messages from save("test.stl", r) and found your __init__loadsave function that works like a charm.
While this is somewhat of a dirty trick, It'd be good to mention it somewhere in the docs.
Also: it's been sitting on master for 5 months without a release ;)

ConstructiveGeometry.jl/src/ConstructiveGeometry.jl

Line 2010 in 1205666

function __init__loadsave()

[plut]

I wrote a short paragraph on this topic, it should be online within a few minutes.

(Sorry for the late reply — this package is a hobby project and I don't always have as much time as I would want for it).