Fix typo and missing print_function_name()
Add dummy keyboardless APIs
Implement chewing_cand_open()
Implement chewing_cand_close()
Implement chewing_cand_choose_by_index()
Add new APIs for candidate list control
ChoiceFirstAvail -> ChoiceInitAvail
Implement new internal ChoiceXXX functions
Add ok_candidate_len to testhelper
Implement new APIs for candidate list control
Add test_cand_choose_second_layer
Do not create coverage for header in coveralls.io