Pycam

* support binary STL
* close contours

* linux compatibility
* integrated kdtree
* fix speedup shortcuts

* some feature requests
* fixes by Dan Falck
* fix bug in torus-point intersection
* specify model in cfg
* fixed opengl representation
* update tests

* another try at fixing PushCutter
* remove MGED exporter

* fix glutInit bug

* fix verticals intersection
* add ContourCutter
* guard against float division
* add x/y direction
* add ContourCutter
* minor layout improvements
* make speed configurable
* enable command line driven operation
* debug output
* SVG output