Adding the OpenSCAD exporter to configure.ac
Adding the OpenSCAD exporter to src/Makefile.am
Adding the hid.conf file of the OpenSCAD exporter.
Adding the OpenSCAD exporter.
Added a default GPLv2+ license text to the OpenSCAD 3D-model file.

Changed and improved some comments in between 3D-model code to
allow for better human readability and understanding what happens
where.
Added the pcb copyright notice.
Correction of a copy-paste leftover in the OpenSCAD 3D-model file license.
Determine the package type based on the modelname and add this information to the 3D-model output file.
Remove fp suffix.

Test for the occurrence of an accidental ".fp" suffix in the
modelname string and remove this suffix from the modelname string.
Include the packages container include file in the exporter output.
Correction in comment.
Correction in indentation.
Added openscad_get_basename().
Added doxygen comments for documenting the code.
Added openscad_get_dirname().
Added an entry for an include directory.
Corrections in indentation.
Extended the OpenScadList struct and added Doxygen comments.

Added a package_type member to be able to refer to a generic package type.
This package type is derived from the model name (description field in the pcb element).
Adapted to the recent nm resolution changes.

Changed existing macros and applied the now needed macros COORD_TO_MM
and COORD_TO_MIL due to the nm resolution changes.
Initializing the HID struct has changed.
Added a README file.