Move Print object storage to C++. (along with its subobjects)
Call Print object's set_total_ functions correctly.
Add ::Ref classes for every missing C++ class (going by REGISTER_CLASS calls).
Return NULL values from XS as undef.
Spelling fix to test description in custom_gcode.t
More accurate test for filename placeholder substitutions.
Add test for region config being set from model object config.
Try to fix _copies_shift scaling.
Remove some more Clone typemaps and add some whitespace.
Remove some unused array accessors.
Switch to Point3 in XSP, too.
Add typemaps for Point3.