the class constructor and read_sst_log now accept a time_zone argument. Ex: 'Europe/Brussels'.
if such an argument is passed, the SST log checks if the specified data ranges contain a DST in that time zone and returns a boolean in an additional log column 'DST_crossover'.
Change BaseLog class:
read_sst_log
now accept atime_zone
argument. Ex: 'Europe/Brussels'.