benchs: update run programs. Remove pep8analysis because it is too fast

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: use the bootstraped nitg because it is correcly compiled since d055af3c72

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: update compilation options (faster, slower, etc.)

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: add more engines and gc options

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: produce .xml files conform with junit

Signed-off-by: Jean Privat <jean@pryen.org>
bench: add generated files for xml and html to .gitignore

Signed-off-by: Jean Privat <jean@pryen.org>