
Major step forward once more: calculate_user_dst_table() now always sees the
user's effective timezone correctly using get_user_timezone(). It also remembers
which timezone was in effect when it cached its calculations, so if the user's
effective timezone changes for any reason the table is automatically re-computed.

******
NOTICE
******

From this point onward, DST support should be working again, and there are no more
visible hurdles in the way. This means it should STAY working correctly until 1.5.

dilawar/moodle