Fix the bug which caused section.primary_section_* being null even the SWS Section payload has PrimarySection element for primary sections.
2.4.11
There is a known bug when passing a timezone object to datetime constructor https://bytes.com/topic/python/answers/676275-pytz-giving-incorrect-offset-timezone
2.4.10
Rolled back the change on SWS_TIMEZONE (still using pytz)