* removed unused debugging statements
* see: https://sourceforge.net/tracker/?func=detail&atid=1104176&aid=3546415&group_id=237831

* additionally some coding style modifications were done

* added some more debug output
* scale and shift the 2D model to (0, 0)

* works for simple polygons (otherwise: segfaults)

A missing binary flag during "open" caused incomplete read operations.
Thus the length-based validation of the binary STL format failed.

value handling needs to be fixed

The file LinucCNC.py is supposed to be a good example for a machine-specific
language export definition.

* this allows to handle the filters separately instead of applying the immediately

* filters in Toolpath are now read-only and protected by property functions
* change of filters -> clear toolpath cache
* add "comment" as new toolpath record

* added "weight" attribute to allow sorting
* added PathMode (G61/G64) filter
* fixed typos in TriggerSpindle filter
* fixed typos in StepWidth filter

* random EOF (0x04) characters break the input stream in text files
* solution: open files in binary mode instead (ignoring EOF characters)

* SelectTool
* TriggerSpindle
* StepWidth

* this currently fails to expose the tool radius to the path processor

* many events are not grepped due to linebreaks

* fixed source directory
* moved the script to "scripts/"
* ignore long lines

Otherwise the "last" (based on the order of plugin initialization) toolpath
processor is selected. The load order is arbitrary - thus the initial processor
selection not determined. (we don't like this)

* tabs in the gtk.Notebook are now hidden, if all children are disabled
* removed previous (ugly) attempt of hiding empty parents
* added path_mode and similar attributes to the "Laser" postprocessor
* improved layout of "settings" tab in gtk.Notebook

* additionally: hide a ParameterSection if all children are hidden