tor/changes/bug13476-improve-time-handling

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o Minor bugfixes:
- Set the correct day of year value when the system's localtime(_r)
or gmtime(_r) functions fail to set struct tm. Not externally visible.
Fixes bug 13476.
- Avoid unlikely signed integer overflow in tor_timegm on systems with
32-bit time_t.
Fixes bug 13476.
o Minor enhancements (validation):
- Check all date/time values passed to tor_timegm and parse_rfc1123_time
for validity, taking leap years into account.
Improves HTTP header validation.
Implemented with bug 13476.
- Clamp year values returned by system localtime(_r) and gmtime(_r)
to year 1 in correct_tm. This ensures tor can read any values it
writes out.
Fixes bug 13476.
o Minor enhancements (testing):
- Add unit tests for tor_timegm signed overflow, tor_timegm and
parse_rfc1123_time validity checks, correct_tm year clamping.
Unit tests (visible) fixes in bug 13476.