Feature request: Include full path in error message instead of just relative path

[pickhardt]

Feature request:

I can't find where in the code this happens, but when I get the error "File to import not found or unreadable" it'd be really useful to output the full path it's looking for. The relative path, while helpful, doesn't tell the full story. It'd help with debugging where it's looking and how I should be writing the path in the file.