doc: Changing *c-cc* is fair game as well

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>
Add an API for accessing the c-cc field of struct termios

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>
Documentation for c-cc API

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>
doc: Cosmetics

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>
Simple tests for c-cc API

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>