Bug [3599194]: compat/fake-rfc2553.c is broken
For Unicode 6.3, mongolian vowel separator (U+180e) is nominated to change character class from Space to Control character. 
Make sure that "string is space" will continue to return 1 for this character. See TIP #413.
merge trunk. 
Update all unicode tables to current state of Unicode 6.3 (not released yet)