Issue #2382: SyntaxError cursor "^" now is written at correct position in most

cases when multibyte characters are in line (before "^").  This still not
works correctly with wide East Asian characters.

diff --cc Lib/test/test_exceptions.py
Simple merge

diff --cc Lib/test/test_traceback.py
Simple merge

diff --cc Misc/NEWS
Simple merge

diff --cc Python/pythonrun.c
Simple merge