Update the map data and improve behavior:
    
    - Render the map directly from SVG (#1335158)
    - Fix memory leaks in tz.c
    - Fix an invalid memory access
    - Do not modify TZ in the process environment
    - Move all data files to /usr/share/libtimezonemap from .../libtimezonemap/ui
    - Add extra city data so all timezone offsets are clickable
    - Move Venezuela from -04:30 to -04:00
    - Fix the conversion of points just west of 180 longitude
    - Remove the out-of-date Olson map data
    - Update the "backward" file
    - Improve the location selected when setting the timezone by name (#1322648)
    - Remove an extra line in the +10:00 layer
    - Move Chile back an hour