files but only manipulates paths. It produces both ablsolute and relative paths. COLLADA exporter can now use it.
- re-wrote unit test for it, this is now more compact and readable
- RNA API Image.get_export_path takes a boolean arg to indicate whether a relative or absolute path should be returned. Python scripts
can now use it.
- freeing strings returned by RNA struct functions in RNA_parameter_list_free
Unit tests:
- check that BKE_export_image actually creates a file. This test is becoming dangerous: it creates and deletes files under /tmp.
Having written this complicated test function I now realize it's much easier to write tests in a scripted language, which gives more
freedom in expressions and need not be compiled.
- replaced BKE_copy_images with BKE_export_image, now it handles only one image at a time, this is better since for exporters it is
easier to export one image at a time writing new image path to a file
- exposing BKE_export_image in RNA as Image.export, interestingly, RNA allowed me to define a function with PROP_STRING return type
although it doesn't free memory, will fix that in the next commit
- removed bpy.util.copy_images
Unit tests:
- re-wrote a test for BKE_export_image, it's more compact now
- moved unit tests to the creator module to avoid another executable, now running tests with `blender --test`
- as before, unit tests are built only if WITH_BF_UNIT_TEST is non 0
