nitc: fix super-call on inherited method

Signed-off-by: Jean Privat <jean@pryen.org>
tests: add base_super_linext2 for super-call on inherited method

Signed-off-by: Jean Privat <jean@pryen.org>
nitgg: generate filenames with less potential conflicts

Signed-off-by: Jean Privat <jean@pryen.org>
sqlite: use include <>, not include ""