Joseph Lenox a2fb7313c6 Configurable overhang threshold as function of perimeter width (#3752)
* Fix automatic overhang threshold

We should be supporting perimeters that are overhung further than half a
perimeter out, rather than two times the perimeter width.

Fixes: #2068

* Made the overhang detection configurable, up to 200 (the original value, which is still the default)

* Set default to 60% as per https://github.com/alexrj/Slic3r/wiki/Support:-Requirements
Removed some less useful enumerations (0-30%)

* Folded in auto_threshold into support threshold as a % value
2017-03-11 17:22:06 -06:00
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