Remove explicit visit_qpath method
Remove explicit visit_qpath method

Instead of replacing the default behaviour of the visit_qpath method,
I've moved the printing code to private method of PrintVisitor
(print_qpath).

graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust