Class for locality metadata
When reading without metadata, then locality is named after file where the data come from, or after the sensor id where the data come form.
locality_id
name of locality
elevation
of locality
lat_wgs84
latitude of locality in WGS-84
lon_wgs84
longitude of locality in WGS-84
tz_offset
offset from UTC in minutes
tz_type
type of time zone
join_serial
list of serial numbers of loggers for join operation
user_data
list for user data