Update to 2.6.6
    
    - When checking whether to show inline completion, normalize the first candidate as well
    - Two more test cases in hunspell_suggest.py
    - Make it work correctly with newer French hunspell dictionaries
    - Skip some unittests when dictionaries or python modules needed are not installed
    - Update emoji annotations from CLDR
    - Add more test cases to m17n_translit_test.py for si-sayura.mim